I was never bullied while I went to school, but some of my friends were.
What I hate is bullying in high school. I saw it happen a lot at my high school. It got so bad that someone who was having problems with his family committed suicide during my senior year (I think he was a junior?). You would think people would finally mature up by the time they get to HS. Nope, some just don't. People you see who are bullies during those years are just going to fail when they graduate and get out into the real world. Bullying in no way prepares you for the real world.
If you're in high school and have a bully problem, just laugh at them. You should act mature in high school, not act like you did in the fifth grade.