I once had a bad teacher. She is patriarchal. The girls in the class will be punished physically if they make a mistake, but she has never punished the boys physically.
I once met a bad teacher. She values men over women. A girl in the class will be physically punished for every mistake she makes, but she has never physically punished a boy.
I once met a bad teacher. She prefers boys to girls. A girl in the class will be punished by corporal punishment if she makes a little mistake, but she has never punished a boy.