My kid had a similar problem at school, kids were messing with him. I told him to ignore them unless they make physical contact. Then punch them in the face as hard as you can. He doesn't like violence but I said good neither do I. If you do it once the right way you won't have to do it again. Make an example out of one and the rest will stop. This is the Israeli way. No eye for an eye shit. You can talk all you want but if you take one hair off our back we will gouge out your eye. This way we have all the hair on our back, you still have one eye and everyone else have two eyes because they saw what happened to you.