Here's what I have to say to people who still think it's funny to use "gay" to mean "stupid": Y'all sound like a bunch of fucking GRADESCHOOLERS. STOP IT. There are still a bunch of assholes in positions of power out there like James Dobson, Jerry Falwell, Rick Santorum, and most of George W. Bush's daddy's cronies (as well as noisy buffoons like Fred Phelps), who are working as hard as they can to make life hell for gays. How nice for you that you don't think it's a big problem. But, well, you ain't fuckin' helping.
And don't give me any bullshit about not having a sense of humor. I have one. I laugh at at things. Ho ho, look at me, I luff ze funny funny! The fact that my sense of humor doesn't match your nasty puerile little black-hearted excuse for one is something I'm PROUD of. And some people who say "that's so gay" even claim to be gay themselves, so hey that makes it all right doesn't it? Yeah, Roy Cohn was a self-loathing homosexual too, you know. (As well as a self-loathing Jew. What a fucking paragon of a role model HE is.)
You wanna use a slang term for "stupid"? How about 'pid? Try it!