I’ve wondered that myself, but I’ve come to the conclusion that transgender individuals seem to value their privacy more than the average person. This is all due to increased cyber bullying to them online. Linux is well known for being free from data collection (except Ubuntu) and corporate greed, so it would make sense if this was an operating system of choice.

It is (at this point) an old meme.

https://knowyourmeme.com/memes/programming-socks

It is similar to this meme too.