I'm not going to say your teacher was abusive. I wasn't there. But I will say that this precise attitude is how situations that are abusive continue: the survivors view the experience as strengthening and/or empowering. "That which doesn't kill us, makes us stronger."
That,s your view. I would say that's a complete misreading. The most valid thing you say is that you were not there.
After that point maybe you should either enquire more or or admit all else is assumption, probably way off track.