He was a jerk. If you were a male and a jock, he liked you. If you were anything else, female, nerd, it didn't matter, you were a turd to him and not worth his effort.

I had the nerve to look at the clock during one of his lectures, which was actually a tangent about something, and he called me a turd and made me sit in the back of the room. For spite, I got an A in the class. I will never forget the way he treated me..