I live in an area where there are a lot of do or die Quarter Horse people. Love Quarter Horses, have one purebred and one mostly QH in my barn now. I used to have a mixed breed mostly Morgan gelding, and we frequently lost a lot of Showmanship classes to QHs with obvious performance faults. Our rail work deserved beating half the time, he had a rough trot for western, ha ha.
I'll never forget one show, though. It was my 4-H club's show, where only my club competes, sort of a schooling show for the year and to get our required Grooming and Showmanship score. Most of my club are gamers, and so don't put a lot of effort into correct turnout for G&S, but they do have clean horses that basically know the showmanship drill. At the time, with my Morgan mix (quite obviously no QH, would have tanked a stock horse halter class, ha ha), I left his mane long. Correct for breed, and for his daily-turnout, fly protection requiring lifetyle. After the class and before the placings, the judge commented on the class. She very condescendingly said that all of us needed to work on our clipping and braiding/banding, and that since we all had QHs, we all needed to pull the manes to 4 in. And shave their ears clean inside! Now, this was my club only so I knew all of the horses well. The class had six horses, and only one was QH! Including my Morgan mix, there was one Appy (with spots!, not a lot, but with spots), an MFT, a complete mutt (cobby type), and one sport type paint! Grr. Granted, the Appy maybe should have been pulled and banded, but any judge should have recognized that these were certainly not all QHs!