The teacher got drunk in class,

Your teacher went too far. How can you say that about your students?

Did you study in other big cities before, and then went back to your old school? Ignore him, he is probably mentally unbalanced. You haven't done anything wrong, don't care what others say. He must have something unpleasant himself. If he drinks too much, he will take advantage of it.

It's okay. Later, when he wakes up, he will definitely feel that he is wrong. You don't have to argue with him, just pretend that it never happened. Don't worry too much, the more indifferent your attitude is, the people who see jokes will become jokes themselves.