This is a very common experience among Japanese teachers.
A student asks, "Sensei, can I call you おまえ?" Then Japanese teachers tend to be at loss for words for a moment because it is only okay to use that word between close male friends. Never, I mean never address your teacher with that word. It is rude and rather condescending.
Then this student continues, "How about てめえ？ Or maybe きさま?"
Unfortunately, these are also not acceptable. It is a very rude way to address someon