To me, it seems like a horribly hostile approach to teaching people, which comes across as saying, "In order to learn anything from me, you must abase yourself before me." Which is to say, "I am incapable of conveying useful information to anyone who does not present abject submission to me."

But then, it's possible that I'm just hearing Severus Snape (or the class of lousy teachers he is an imitation of) in the "so you think you know everything?" bullshit.