How to deal with people who can't see you clearly, slander you to your face, imitate you privately and imitate you?

Deal with it? Oh, you don't need to deal with it, then you respect him too much. Such people and birds don't care about him at all. Don't have any negative feelings about him, because if you get angry, you lose. Treat such people as buffoons. It can only make you laugh, but not bother you. If you are a kind person who is not as indifferent as I said above, you can also treat him with a kind and compassionate attitude. You can choose whichever you want.