I had a calc prof who spent most of a class lecturing on "RTFT," where the last T was Text Book instead of M for Manual because he thought somebody asked a stup

I had a calc prof who spent most of a class lecturing on "RTFT," where the last T was Text Book instead of M for Manual because he thought somebody asked a stupid question. To be fair, the question was kind of dumb. But the textbook was also worthless and created to generate revenue for the math department. So it's unlikely his proposed solution would have helped the student in question. Not to mention that the lecture on RTFM didn't help anyone learn math anyway. The student who asked the question probably never really understood the math (wrote learner), but did become the prof's office hour best friend and got a good grade anyway. Anyway, file under the teacher hostility section of this article, I guess.