I’ve never quite understood students who teach in class. Not TAs or grad students, but undergrads within a class who feel the need to teach. Sometimes they’re teaching the very thing the professor is trying to teach, and other times it is completely unrelated. It has always struck me as odd, and I’ve seriously considered dropping classes when I discover I have a student teacher as a classmate.
There are times I can almost understand it – sometimes your educational background has taught you something that conflicts with what you are being taught now. It happens to me often, but I ask the professor after class, instead of explaining where I am coming from to the entire class, and then asking my question. A little perspective goes a long way.