Yes, I understood that. Still hard to see the point-I wasn't going to make HIM see his errors (that would, at the least, take some references I'd suspect) and wouldn't have convinced his students of anything (he was the instructor, and I was just a guy in the class.)I didn't say call him out as wrong. Ask him for clarification in such a way it becomes obvious he is wrong.
I've considered calling to discuss it with him following the class, but suspect it wouldn't do a whole lot-he was very.....let's be polite and say 'confident' of his expertise.
Larry