IMO, bullies are attracted in some way to those they target. The best defense, then, is to make yourself unattractive to them. Walk with confidence and pride. Don't show any vulnerability. Bullies tend to pick on people who display ow self esteem and confidence. Looking back on my high school years, I can say that though I didn't have terrible bully problems, those problems I did have could've been eliminated if I'd have followed that advice.