I don't think it's true. I think most gay men in America prefer cut guys. Some guys post cut ony when looking for a guy, they won't even sleep with an uncut guy.
while some prefer uncut , but will go with either.
I am uncut and would never get cut, but I think that the cut penis is much more attractve looking, especially while limp .
I think some that people think that an uncut dick is dirty because they hear about smegma (which I never had)