My first driving instructor was the most cynical, misanthropic person I ever met. I have no idea why he chose a career in teaching when he so obviously loathed working with people. The most accurate description I can think of is a mix between Dr Cox and an old guy that always complains about kids on his lawn.
He would scream every command. TAKE A LEFT HERE!! SLOW DOWN!! CHANGE GEARS!! DO IT NOW NOW NOW!! If I did anything wrong (which I of course did all the time, I was a newbie after all), he would go on a long and very loud tirade. So he screamed constantly at every mistake, but when I did something right, he would just sit there quiet, fuming. Like he was upset that he didn't get to berate me. I remember once when I didn't look carefully enough while driving past a crosswalk. He went berserk and constructed a scenario where I accidentally hit and killed a child, and then asked me what I would say to the parents at the funeral. It wasn't a rhetorical question mind you, he expected an answer. Then the biggest slap in the face: when the lesson was over, he told me I needed to relax more. MAYBE IT WOULD BE EASIER TO RELAX IF YOU WERE NOT THE MOST AGGRAVATING PERSON I EVER MET YOU F-
Anyway, I eventually got another instructor, and things went a lot smoother.