The only way to stop people from insulting you, is to screw them
back hard, even you keep quiet, they will probably thinks that you
are easily to be push around with.
There used to this guy, when i was in my school, and there is a lot
of name calling, going around, he was named as porky, not because
of his size, but he was anti social, if that guy at least mix
around with people, this will not be his outcome at all.