Lol no thats not why they get offended. If you tell a cis person "they are trans" that means they look like the other gender. Its the same as misgendering a trans person but with a few extra steps. Also maybe they are attacking you because this is harassment...
But why would that offend if you constantly tell people there's no difference tran women and cis women. If you told a trans person you didn't believe they were trans they would probably take it as a compliment.
That's just meta-misgendering and talking over women. No kidding they treat you like an asshole. That's not a contradiction; you're just being an asshole.
Reminds me of the time I was at a trans camp as a young cis gay ally. A woman walks up to me and says, "since when have you been transitioning?" and I scoffed at the thought of assuming anything about anyone, especially at an LGBT+ camp. She thought I was scoffing at being confused for a trans guy. We didn't speak for the rest of the event because she thought I was being weird. 🤷♂️
Eh, i cackled. If someone tried that on me there'd be zero personal offence because i don't see being trans as bad.
i'd probably get a bit pissy at the thought you can 'clock' a trans person, or because telling a trans person they're 'passing' is very very problematic, but at someone thinking i'm trans? Yeah that's not an insult to me.