I've never heard of Paints being bashed. Around the open shows in my area, people use Paints for just about anything. They're actually pretty popular in the hunter ring around here. We have a pretty good variety of horses and riders and fortunately most of them are decent people. Thoroughbreds are the ones who get made fun of here. My farrier teases me relentlessly about my "big **** overgrown pony".
Just ignore the morons who bash your horse. They don't know any better.