Don't be mean back you just have as much guilt as the person that was rude to you. If you don't like what their doing to you just ask them to stop if they don't, tell them to stop, if they keep doing it you should tell a trusted adult. It always helps me when the problem has gotten out of hand and I tell my mom. Just don't forget that maybe you say that you go to hang out with another person because you kind of get tired of the person and your friend see that your laughing and they think that your laughing at them, and they start a rumor that you pick your noes and you do the same to them, other people might not want to be your friend because they dont want to go through that. As I said earlier it hurts everybody.
XOXO
GABY