I don’t know what you mean by “mainstream homosexuals”. By definition same sex sodomy cannot possibly be “mainstream” unless you mean dressing in normal haircuts and suits (during the week...)
And if a large number of homosexuals objected to the “Gay Pride” crapola, how come we never hear of their objections?
Groups that organize around wickedness always try to enforce membership by persecuting those who try to leave. Look at Scientology, for one contemporary example. The Mafia is another -- leaving can get you whacked. There was a recent flap over a black sportscaster calling a black player a "cornball brother who is not down with the struggle." Successful blacks (presumably not struggling) like Condoleezza Rice and Alan West are routinely vilified by "colorists." And gay people have the same situation -- if they try to leave the plantation, their friends try to shame them.
I, a woman, was having dinner with a gay male business associate one evening, when an acquaintance of his came by the table and snarked, "Oh, Michael, I didn't know you were a lesbian." In other words, his being gay had to be absolute. His dining with a woman had to be a manifestation of homosexuality, not of genderblind friendship.