@Arrian my theory:

1) he is "neurodivergent" being a man with ADHD, he's different from what the "normal" person would be like so he is easier to relate to for people who are also in that sort of spectrum.

2) he's inoffensive in all regards, not making his shit solely about lgbtq stuff (and thus becoming a caricature) and not saying anything bad about it either, and he does this with everything, which makes him easy to watch for anyone. he's very good at staying away from controversy, relatively speaking.

3) because of 1 & 2, the lgbtq people that watch him recommend him to their friends in their community and from there it continues to catch on.