how to ignore bad people?

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Ask yourself this: Ignoring someone is a serious decision and it could really hurt them - make sure you're ready to cut ties with this person for good. Don't plan on ignoring someone for a day or week just to get attention. If you can approach the person directly with your problems first, then turn to ignoring them if they still won't solve them. Remember that people make mistakes. If you feel you've come into contact with someone toxic, or have run out of ways to solve the problems. You need to get yourself out of the situation or relationship. Unfortunately, most people are weak and a simple apology will bring them back

1. Know the motive behind their actions. Before you resolve to ignoring someone, consider not only what they did to bring you to this point, but also why they did it. Don't just ignore someone to make a point, although it is a powerful way to make a point - that is immature and will slow down any resolution. If you need time away from them then you should tell them so. If you've reached the point where you really can't put up with them any more, they are probably aware of the problem too.
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   Before you give them the cold shoulder, try voicing your concerns or telling them you need to "take a break". If you can both see the good in separation, everything will be more peaceful and less intense.
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   Be direct with them. Firmly tell them why you don't want to know them any more. You don't have to be nasty about it. You can be polite and respectful; however, you need to let them know you aren't available any more. Some people will still refuse to accept this though, so you will have to be very clear. Stop taking calls from them, don't read their emails, and block them on instant messenger. Don't be rude or rub it in and don't give into their attempts to provoke you into response. Just stop communicating with them at all. Don't bicker. If they approach you in public or start making rude comments, clearly tell them you want them to leave you alone from now on.
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   If they continue seek help. Tell them that if they do not leave you alone, it is considered harassment and you will inform a fitting authority. In most cases things will not escalate to this level, but if they do you need to show them you are willing to put an end to it and fast. In other cases go ahead and file a complaint with the authorities anyway. Sometimes, a preventative action is best and will ensure little or no contact.
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   Understand the consequences. This person will be angry. Being rejected by a friend is hard to cope with and some do it better than others. Prepare yourself. Inform mutual friends that you intend to end contact with this person and if they have questions answer them - don't be too eager to talk about this person though. The point is removing them from your life and dwelling on the issue will be counter-productive. If you need to, inform family members you don't want to be contacted by them. Don't try to get others to join your "side" or get involved - if your target tries to do this to you, react by letting people know that they can make up their own minds. Let them know your position. You just want to let it go and be left alone. Most people will understand this and if they don't they eventually will. You should, however tell mutual friends that they will have to "choose sides" in the matter or they will be ignored as well.
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   Ignore the steps below if the steps above have helped. If they're still persistent in their attempts to engage you in any form of conversation, then continue.
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   Focus on your reasons again. Why do you want this person to get out of your life? Remember the ways in which they limited you and how they hurt you. Feel good about your mature reaction. Ignoring someone can be difficult and is the last step you should take, so your reasons must be firm.
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   Refrain from all communication with the person. You should already be doing this, but they will try to make you pay attention to them - first by being angry in return, then by trying to tell you what a bad person you are for ignoring them. Once you don't give in they will try to work through other people, eventually becoming vindictive - showing up where you work or yelling at you if they catch you alone. Even if you don't want to pursue legal action, the threat alone may get them to stop. If it continues seek the help of an authority figure, even if that means contacting a lawyer.
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   Stop greeting them. Don't feel like you need to say anything to them for etiquette's sake. Should contact be absolutely necessary, minimize it as much as possible.
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    Don't respond when they say hi. If they really won't stop, just say "Please don't talk to me," and walk away.
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    Never make eye contact with the person. Not even accidentally. Don't acknowledge their presence. If they say things like "You can't even look me in the eyes," don't respond. Tell them assertively that you want them to move on.
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    Manage your schedule. This is to ensure that you don't come into contact with that person.
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    Forget all those bitter remarks that the person makes about you. Even if they say your house smells like rotten pumpkin, they're just attention-seekers and they want to annoy you. If they persist, file charges. It is harassment.
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    Keep yourself busy. Spend time doing your own activities like knitting a sweater or playing sport. Try to develop a new hobby just to get away from the person. Do not invite them to watch any of these activities. They may be oddly attracted to you afterwards.
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    Celebrate the freedom! Enjoy the peace of mind knowing that person is not actively a part of your life.
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    If they are on your Facebook contact list - there are several ways to ignore a person who is constantly harassing you on Facebook.  
    1. If it's by email/wall post - don't respond and delete the email or wall post.
    2. If it's photographs - delete the offending photographs and/or remove any tags if any.
    3. By putting yourself offline.
    4. By removing that person off your friends lists.
    5. By blocking and/or reporting that person.
    6. If they request to be your 'friend' on Facebook - decline their request.
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    CUSTOMIZE your privacy settings and LOCK your page so that ONLY close friends and family can see your information and your photographs. Also provide none or as little of your personal information on Facebook, do not display the following:
    • Your landline/s and mobile telephone numbers.
    • Your full date of birth (either omit your birthday or just put the day and month), this prevents ID theft.
    • Your home address (if you want to say where you live, just give your town e.g. Westhoughton, Bolton, Manchester, Blackpool, Liverpool etc.)
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    Don't let them use a common person as a go between.