Admitting that I'm straight, old, and have never paid close attention to the (ever-changing) ideology/politics of GLBTQ... - I suspect this is very similar to the prevalence of gays in IT, back in the second half of the 1900's. If you are uncomfortable, or unable, wrt/"fitting in" socially in groups of young, straight males (often noted for their excess of machismo, and pressure to conform) then "retreating behind a keyboard" can look like a great option. IT & programming seem (and fairly often are) meritocratic - in the "management don't much care who you are, if you can make the computers work right" sense. And at least since the late '60's, there's been something of an "oddball personalities" reputation to IT/programming. That's made it easier to mostly fit in there...while still being more yourself, maybe staying in the closet, and maybe sitting on the fence as you try to figure out who you are.

EDIT: Agree with tene80i's comment about "trans agenda". Every (n < 5) trans person I actually know has a big, angry chip on their shoulder - about people assuming that they are somehow associated with whatever the currently-trending assertions of the most-vocal 0.01% might be.

(And, yes, I get that "trans agenda" often refers to an ugly "Elders of Zion" caricature, constructed by nasty right-wingers.)