For two, and this is just out of curiosity, what's the reason for mentioning you're trans? I don't mention I'm cis when I introduce myself, it seems like nobody should care.
Humans connect via points of commonality, especially ones that aren't so widely shared.
I do see your point about points of commonality, I'm just curious why it was just that one and not hobbies, etc then. I just don't think that being trans should be pointed out as being "niche", I'd rather it was just your gender and we forgot about it.
But also because I’m trans, and that’s going to upset a small number of bigoted people who will refuse to follow me, and that’s how I’d like it. And since I post about being trans they’re going to find out eventually, and be a problem on my feed.