I've seen snotty people in every discipline and there are so many who believe that their way is the ONLY way to train/ride/do whatever you are doing. I ride both English and Western and I have had my English tack scoffed at by western riders and the idea of me gaming looked down on by English riders (I must beat my horse and spur it like crazy if I game... pfft).
The thing that I find ridiculous is when one discipline claims another is abusive, but their discipline couldn't be because it teaches the horse how to properly move in this or that way. I've seen abuse of one kind or another in EVERY discipline, so don't hark on other people's disciplines, hark on the bad practices within them. Everyone is very good at justifying practices that are actually harmful to the horse in their discipline and pointing out the harmful practices in other people's.
Just tack your horse out like this and watch their head explode!
Oddly enough, the one snob I've met was in a feed store. I was just trying to buy some hay, but I heard her go on & on about her incredible horses and how I should train mine (and my only comment had been to admit I had an Arabian mare - the woman didn't like Arabians, "too much snort and blow"). Later, the lady in the feed store told me the woman had 18 horses, none of which had any business being bred...
That will certainly not be the last one you meet. I work at a barn filled with opinionated pony club moms who think they know everything, when they honestly have no idea what they're talking about. They also make drama out of nothing. The list never ends. Although not all of them are like that, it just depends on the person I guess ;).
In my experience, people with little talent or knowledge or ability tend to be the "know it alls". Anyone who has really spent time in the saddle tends to be a bit more humble.
I remember a girl in college that bragged all the time about her great knowledge. I reluctantly agreed to let her ride my fat, lazy pony. She was obviously terrified on the little horse. Eventually, she brought her horse to college. This was the horse that was better than everybody else's horses. The horse arrived in a rickety, homemade trailer pulled by a station wagon. When the infamous horse that was greatly superior to my horse was unloaded, it was underweight, had long hooves, and was filthy. 200 pounds later, it was not a bad horse, but she really would have been better off keeping her mouth shut.