Why won’t anyone teach me math?
I think math departments are for some reason especially miserable. One of the calc profs at my college wasted a whole class period on "RTFTB" - "read the fucking textbook" after somebody asked a relatively obvious question because of confusion. Have experienced intentionally discouraging practices in other departments of course, and there is something to be said for not telling the hopelessly ill-prepared "you can do it" while failing, but that's not the right way, and seemed particularly egregious in math courses.