I always find it amusing when teachers or professors ask opinion questions and proceed to tell you you’re wrong. Your reasoning may be wrong, your premise may be wrong, but it’s you’re opinion – they may disagree with it but when stated as your opinion it can’t be wrong. Back to your question, the one time I realized it and it stuck with me, I spoke up and was thrown out of class for it. I was let back in the next week, but the professor never responded to any question or raised hand of mine again.