This is a forum, your supposed to discuss opinions. You'v been here long enough to understand that I'm sure. No one is shoving anything down anyones throat. The only person getting upset here is you.
You will be hard pressed to find people in the QH world looking back. Because its pretty **** near impossible to trot a straight line while looking back. Plus is looks sloppy. Certainly there is no rule about it. Just like there is no rule about having a fake tail in, but you will never see a person at a breed show without one. There are plenty of un-spoken rules in all aspects of the horse world. This happens to be one of them.