I had a professor in college that made it his mission to drill in this lesson. He was a retired company president that taught college business courses to have something to do in his retirement, so he really didn't give a d@mn what people thought. He was also VERY conservative, which was a rarity in itself.
If you made the mistake of saying something in class that you couldn't back up with research or evidence or if, god forbid, you said "I think..." or "In my opinion..." he would go ballistic. His tirade usually went something like, "You are a sophomore in college, sitting here on either mommy and daddy's or the US taxpayers dime! You have accomplished NOTHING! You have experienced NOTHING! What you "think" or your "opinion" means NOTHING! Until you can back up your statements with evidence from people that have accomplished something, sit down, shut up, and don't waste my time!
It was beautiful! I saw some liberals reduced to to tears and quickly drop the class or even in some cases change their majors.
I just read that to my wife. Thanks for making our evening. Very funny!
We need more educators and politcal leaders like him.......