It’s kind of been a known thing among trans men communities that trans men tend to pass more in rural/more conservative areas than urban/progressive ones. This is something I’ve seen referenced, oh, probably for 20 years now.
Having grown up in a conservative area, I think there’s an element of conservative communities sort of believing that if someone doesn’t look like a cartoon caricature of a queer person, they must be cishet and any ‘evidence’ to the contrary will be waved away. So what would be called a baby face in a conservative area might be seen as a feminine face in a progressive one.
By contrast in progressive communities, my experience is that cis people will kind of over correct and assume that if you look gender nonconforming then you’re trans. Ask any butch lesbian in an urban area and they will probably tell you that they also get they’d a lot! Obviously it’s not the same as it is for trans people, but it’s probably nothing you in particular are doing to “cause” it.
It’s a sucky experience but try to see it as it is: their imperfect interpretation of you, based on almost nothing other than a quick glance. Correct them if it’s worth your time and do your best to shake it off if it’s not.
Oh jeeze yeah, that and the sudden turbo sexism out of nowhere is REALLY disconcerting when it starts to happen. It’s a real eye opener.