Responding  to bullies is something you need to think carefully about.

The "target" should try not to give away their power. Bullies do it for power. If you respond in a certain way you can give them your power. That's what they want - THE POWER!!

There are many different situations and not one answer. Even though there is ....tell someone. You may need to try different people until you find someone you can talk to. You shouldn't have to deal with this alone.