I don't know a single gay crossplayer... I know a few girls who are bi... but many many more who are straight.
It's just blind prejudice to think "Oh, he's wearing a pink frilly skirt, and attempting to fool people into thinking he is a woman. Obviously this would be because he likes the boys"
As a matter of fact, I think cross dressing is one of the most illogical things a gay man could ever do to get men's attention. The gay men won't be interested, and the straight ones can only be fooled to the point of undressing, tops.