I interact only with people's minds on the internet, so I only want to know about your mind, not your body.
The only time I even think about the physical sex of a member is when I suspect some troll of pretending to be the opposite gender for kicks, like when I'm wondering whether this is a man pretending to be a hot promiscuous young woman.
But when a trans person marks down a gender contrary to their sex, they're just being honest about who they are. When a lying troll marks down a gender contrary to their sex, they're being dishonest about who they are.