Physical bullying is the worst, because really, if adults did it, it would be assault or some other kind of major crime. The fact that physical bullying has been excused, or in some cases even encouraged and commended, for so many decades is a blight on Western culture.
However, cyberbullying is a game-changer that we never had to deal with as kids. Yes, it sucks when people verbally harass you or try to socially isolate you. Back in the old days, we'd brush it off, go home, read our books, watch Transformers, listen to Full Force, and we'd forget about it after an hour.
But cyberbullying is 24/7. It lets bad kids harass you in volume, numbers and frequency that would have been impossible to imagine a generation ago. And furthermore, it begets physical violence. Bullies can plan and collaborate online now. Home addresses can be published. So can pictures and videos. It's insane.