> You are wrong about this. It is both a biological circumstance (though not nearly as crisp a dichotomy as most people think) and a subjective experience, and some people have a mismatch between their biology and their subjective experience. It is simple human decency to defer to how someone chooses to self-identify even if it does not conform to your prejudices about how the world ought to be.
You are dogmatic about this. You are stating things without supporting them with proper arguments, and this is what everyone who defends that position does, while claiming that everyone else is wrong. (Or, at least, I have yet to see the opposite.)
Wtbob has not denied that people have subjective experience of their gender, but has instead claimed that this experience does not match biological reality, which is a fact everyone agrees with. Whether it is "simple human decency" to designate someone in a way that does not match reality because of their subjective experience is, I think, very doubtful. This is not prejudices about how the world ought to be, it is facts about how the world is. However, if we were talking about the name change from Bradley to Chelsea, I would agree because name is not tied to a biological fact but is only what is used to refer to someone. As long as everyone can understand who Bradley and Chelsea refers to, there is no problem with using the one preferred by Chelsea.