Gender dysphoria is oftentimes treated via transitioning in some fashion. Having groupthink on online spaces doesn't alleviate symptoms.
I've never heard anyone except trans activists talking about the specifics of someone's trans-ness in an open setting. Certainly not something someone who's just trying to go about their day would even care about, let alone making a point that "hey by the way you're not biologically a woman, peace".
It's such a weird argument to me. Then again, I'm a dirty "transmedicalist" as labelled by the twitter trans community, so what do I know.