I agree with Minji, but if Ignoring them doesn't work, then every day, as you get ready for the day, think of all the things they could say to you, and think of a good comeback, or a insult to fire back at them.
if they say something really mean to you, ignore them. pretend theyre not even there. that will make them even more mad, and if they still keep on bothering you, come up with a snooty come back. ;) hopee it helpps