Unfortunately many of these techniques were handed down and were common place when I was a kid including many of the salad techniques. In fact, I use to use some of the same techniques until I decided to use my brain and read up on better techniques. I still use corrects but back it up with positive reinforcement.
I remember my mom rubbing noses in poo, pinning dogs with agression issues. using negative reinforcement. She and many others didn't know any better.