Anyone have a good experience other than their mentor?

Has anyone else had a negative experience with their mentor? I want to stand up to mine sometimes but at the same time I feel like I should just let it be. She said according to my university I should be teaching the whole day at this point, I asked my professor and she said half the day. Just a lot of stuff that is really little but really bugs me and I never stand up for myself with some comments she makes, and she’s a huge hypocrite. Just wanna know if anyone else has a similar experience