Ok real help time, I find that saying one word and then dismissing them works well. Here an real life example of me doing it.
*le me, walks by table full of annoying douchebag juniors.*
one shouts out "Hey bro you have a moose knuckle!" just to be a loving annoying douchebag.
Me being the total badass I am says "Thanks bro"
*le me, keeps walking*
They kept trying to annoy me for about a week after that. Sometimes I just didn't say anything to them, I also laughed at them loudly and called them pushovers and made fun of their pathetic excuse for insults near enough that they could hear me. They wouldn't do stuff. After the week was up they didn't bother me.