I don't blame you for being mad at that idiot, bike2math. But I think you have to accept the fact that when you're riding on a college campus sidewalk, you have to be ready for anything. Or walk the bike.

There's a reason these kids are going to school. College won't even fix most of 'em.

If it's your teeth that you're worried about, just use a mouthguard:
http://tinyurl.com/2b4xvm