I won't stay and let you hurt me. Know how far you can be pushed. Tell him your bottom line. Stick to it. Try being nice to him.
Children sometimes hurt others because they feel left out.
If you use mean words and actions back, you are doing Bully Behavior. Do not bug someone who is mean to you. Your teasing gives him permission to get back at you. If you have teased someone in the past, make a new contract with him. Say I'll stop teasing you if you will stop hitting me.