What do I do in this situation?

There is a girl called Grace in my class who I hate because she is a b**** and stereotypes me as a goth/emo/grunger just because I listen to rock and metal. She also made fun of me and my friends by saying she wanted to join our friendship group we said yes then she asked "What do we have to do slit our wrists?" We told her to f*** off. Her friends all ask me every single day why I don't like her and I say "She wiped cheese on my jumper" "She is an evil b****" "She is a bully with no life" etc. It just gets annoying after some time. Also some of her friends are mean to me. I feel like punching them or telling them to f*** off and die. What do I do?