What's a good way to deal with mean girls?

Don't engage them with violence or rumors, or ignore them and don't stoop to their level. Once you're out of their business, you won't have to deal with them again.

Mean girls are often girls who have their own feelings that they project onto you. There are many ways to deal with mean girls and they can all be done separately, used together, or in conjunction with each other. Most people try to ignore mean girls but when that stops working you can stop. Ask them why they are treating you the way that they are. You will make them confront their own feelings while also showing to them that you are making a stand for yourself. If you prefer not to be confrontational tell someone you can trust. If you feel as if there is no one you can trust, go to someone with authority. If you can recognize their authority and also fairness they can help you.

The best way is to let them go away. While asking your self why your attention is drawn to them. Because, attention is not drawn to something by randomness, or by chance. There is a purpose and a reason for each movement in focus. Internal priorities change, then focus changes. So the question that got me out of vicious circles (including persistent mean people around, repetitions) was only this: "why I'm drawing these people around me? what causes me to focus on them that much?" And, then, the inner intelligence will respond (not instantly, but the answer comes for sure). In my case, it was because I needed an excuse, to pass to others responsibility for bad outcomes. Also, there was an understanding of the "game" played, because I was myself mean to others in the past, so I was used to it. And few other factors, besides these two. The best way always is to correct yourself. Correcting others never works, simply because, in their garden, they are the gardeners, not us, they have choice in their own yard, so....

Personally I found that when girls try to intimidate you, the first thing they expect out of you is to back down and look sorry for being in their path. If you are polite to them when they throw verbal jabs at you, it will throw them off guard. If you compliment them, it will have an even stronger effect. Remember that you do not want to be their friend, you simply do not want them to target you. If you are "cool" with them, they will stay out of your way and they will stay out of yours.