If are being bullied verbally you just have to dodge that bullets, it is really easy: don't bother to care for the other's opinions and if you want to fight back you just have to look at the same flaws the bully have, we all have flaws.

But if the bulling is fisical I recommend to leave it or stand up against it. It is a fight or flight response. Look for some authority to help you out, fight back or just run out of there.