@Lurks-no-More @Soctavia
The recent attention surrounding trans Trixie started on Twitter, possibly with this post. Given the confrontational nature of “Trixie is trans” rather than expressing support for the headcanon more subtly, this got people mad. People saw people getting mad and responded with more art of trans Trixie, so it’s become a vicious cycle and art trend.
@Lurks-no-More
It started when Lauren Faust said that Trixie was originally going to be a guy in her debut episode before it got changed to a girl because the studio thought it would be a better rivalry match-up for Twilight.
A part of this left over is that until the more recent seasons, Trixie only had one eye shine in her eyes compared to the other mares, with this trait (one eye shine) being only seen in stallions like Big Mac before.
Also Lauren once made a tweet that there was a character from season 1 that was transgender but she said she wouldn’t say who (although this was also at the same time she was making a bunch of other jokey shitpost style tweets too so take with a pinch of salt).
SO with said above reasons, these are mostly the main reasons as to why a lot of people have the “Trixie is trans” headcanon.