So you'd think "Hey, stop being weird for a week and see what happens" would be useful advice, but that's because you think there's logic to a bully's targeting system. There isn't. Obvious targets such as myself were an exception rather than the norm. Sure, we were there, and we definitely got our heaping helping of schoolyard dickery -- but ultimately it was pretty impossible to predict who would end up on the receiving end of at least some form of bullying. The reason for singling out a victim could be literally anything: People I know have been targeted because they're too "ugly," too pretty, too "stupid," too smart, or just too damn incomprehensible in the eyes of whatever fuckwitted troll-person happens to appoint itself on bully duty.
Sure, there are scientific systems for predicting the whos and whys of bullying. But guess what: When you're wrestling a bunch of kids who are actively trying to shove your head in a bag of dog turds after class, you're not going to stop and consult a behavioral scientist for the reasons behind this particular phenomenon. There's no reason or rhyme to bullying when you're actually experiencing it, whether you're just a bewildered kid or an adult office drone that ends up in the crosshairs of some assface.