[AnimalMuppet]

There's a difference between lay-people who listen, and try to learn, and ask questions to try to learn, and lay-people who say "No, you're wrong, your whole field is wrong, I'm the one with the truth, let me explain it to you."

A professor who doesn't welcome the former is in the wrong line of work. A professor who doesn't welcome the latter is a reasonable human being who gets tired of wasting time.