Tell cold jokes in public.

This is an extremely conscious action to seek self-protection, and to prove her Excellence and correctness by accusing you. In fact, this is also a sign of self-distrust.

I suggest you understand her mentality and make good use of it. After all, it is not easy to find a free supervisor. It is not a bad thing to make continuous progress through her efforts. As for that face, do you think it's important? It's no use, especially in front of strangers