I'd like to add - bronies were among one of the very early communities that troons attempted their subversion on. Back in early 2012 a troon going by the name of Yamino led a campaign to remove a beloved character by claiming it was ableism, which largely succeeded because the troon horde bitched to Hasbro. There were also countless other dust-ups caused by Tumblr retards, as well as the ever classic Purple Tinker. The fandom's been split between the /mlp/ types (weirdos who mostly want to be left alone, but overall pretty pilled on the troon shit) and then the Twitter (ex Tumblr) types.
It's not surprising to see that people think it's completely devolved into some kind of tranny fandom though, odds are if you see one on normie social media, they'll be from the loony troon crowd.