Originally Posted by teh603
That's what I asked too, and the general response (from five of them) was the same: "Because they don't. Now who's the professor and who's the student? Right, thought so."
Oh dear. Teachers can only teach what is teachable. The good ones acknowledge this and inspire their students to stretch for the unteachable. The bad ones invent rules.
And anyway, this is just plain rude. A teacher who responds to a student like this is... well, not worthy of consideration.