First, you are an ordinary person. Keep a certain distance from others. Don't let the bad guys waste your time and energy, because you may not be able to teach him a lesson, and you may be framed by him.

Second, you are much weaker than him. Run! Stay away. If he is a low-level bad guy, he will always bully you and step on you. If he is a powerful villain, he will look down on you or treat you as a pawn. And you, there is no strength to fight back.

Three, you are great, better than him. Teach him a lesson! If he bullies people who are good to you. Or endanger the people. Punish him so that he won't do evil again.