Here is an NYT article on the failure of gays to make it in the world of stand-up comedy. Funny people tend to draw a crowd to listen to their jokes sometime in adolescence, whereas pre-pubescent children struggle to come up with their own jokes, humorous observations, ability to relate to the crowd, and so on. So this is another case of gay Peter Pan-ism. (See the pictures for even more vivid proof.)
It's also a great example of their inability to empathize, another one of their Peter Pan-isms. Their routines focus so narrowly on the boring fact that they engage in the butt sex, and whatever is related to that "lifestyle". Really, who cares? Even chick comics riff on topics farther removed from their personal life. The article mentions that their fellow homos don't find queers funny either, while they show up in droves to see fag hags like Margaret Cho and Kathy Griffin.
We also see another example of how lesbians are not socially and emotionally stunted like gays are. I mean, they are women, so they're not going to be that funny or able to work up a crowd, but Ellen DeGeneres and Rosie O'Donnell are basically competent as comic performers, and they couldn't host successful talk shows if they couldn't relate to a crowd at a level above that of a child. O'Donnell may be a fat, obnoxious battle-axe, but that is a more middle-aged than toddlerish trait. And Wanda Sykes is pretty funny, probably because blacks aren't as awkward and retarded as many white people are in front of a crowd.
There used to be a lot of popular gay singers in the '70s and '80s, all in the closet of course, whereas now there are none. I don't think there were that many successful gay comics back then, but it still goes to show how much better they'll fit into society if there's a pervasive climate of homophobia.