Circa spring of last year, Computer Science 1

The guy sitting next to me asked me a clarifying question about what our professor was mumbling and scribbling illegibly on the board.
I start to respond, only for the professor to YELL at me in front of the class for helping him, saying that programming was a personal affair and that I should be minding myself.
He even yelled at me for helping someone that is "too stupid help themselves" and that I shouldn't worry if the person next to me doesn't get it.
I felt bad, the kid next to me felt bad, and I avoided a semester of computer science just to not have him again.