Anti-LGTBQ “Million March For Children” outnumbered by “Billion March For Not Being Bigots”
(www.thebeaverton.com)
That's a bold but risky move, I wouldn't bet the argument on someone having dug up some obscure examples. The set of people in drag has to contain at least one, and using a 'gotcha' like that could backfire.
But you're right, they do seem exceedingly rare. Like, weirdly rare compared to the general population, even.