I've read a theory that this is due to the way troons recruit. Basically modern troonery was steeped in tumblr and social justice from the get go, meaning many of the early troons were commies. This was an era when the Democrats had only recently even accepted gay marriage, the long ago era of the early 2010s, so mainstream politics were out. So basically newly recruited troons would get funnelled down a pipeline of other troons, at least some of whom would be active communists. Reddit helped promote communism to troons since the trannyjannies of the troon subreddits were of course communists as well meaning troon memes would all be commie memes too.
Old-school communism never had this issue, since cross-dressing was/is considered deviant in commie countries (or outright illegal as in "free trip to camp") while in the West commies until the late 60s mostly hung around actual workers and working class people.