You were doing so well too. It's not that your position rejects scientific authority it's that it pretends to reject this authority having laid waste to any shot at scientific credibility...a bit like becoming a republican after the Queen blanks your handshake at a garden party.
I'm a culture theorist. I don't do natural science. I study culture. I talk about books and appearances, it's a thing, look it up. There is no need for an individual's gender identifications to appeal to natural scientific authority, because gender is a matter of culture. Sex is a matter of the natural sciences. But you refuse to acknowledge that even natural sex defies binary essentialism.
In this thread I posed a number of logical questions that nobody has been able to answer because the logic around this topic is so bad. Maybe you could have a go at this one: a man tells you on Monday that he identifies as a woman but the following day says that he now believes that he was a man yesterday...what was he on Monday?
The man was a man on Monday. He was simply mistaken about his It may seem implausible because it happens so rarely, but it can happen. Consider a transwoman who identifies a man before she undergoes transition, e.g. Contrapoints. She was really a woman all along, atleast
as far as we know right now. It's true that we only know a person's specific authentic gender because we know that this person identifies as that gender right now. Gender is historical and it can change at any time. In the past, the transwoman thought she was a man, but she was mistaken, and now identifies as a woman. She might identify as a man in the future, in which case we would know at that point that she was really a man all along and we would start calling her by male pronouns. But this would be a very rare case.
Take me for example: I used to think I was a masculine man, but in 2020 I learned I was a feminine man. Suddenly, a lot of stuff in my life-history made sense: particularly the way I alternated between masculine and feminine behaviors. But I do know know now that I am a gender-queer, gender-nonconformist. So I was wrong to think I could ever act like a traditional man, especially because I never really wanted to.
So the only person who can get their gender wrong is the individual identifying as this specific gender.
Furthermore, and even worse for you: gender-fluid people exist. A person can literally identify as a woman in the past, identify as a man a man now and claim that they were a woman in the past. And it will be true that he used to be a man before and is a woman now. And in the futue, he can become a woman again.