"Why do you care so much?" is a reasonable question, given that you are obsessed with this topic and on a mission to correct others with what you believe to be "facts".

It is a reasonable question given that your choice of "facts" aligns well with denying that trans people exist. The existence of trans people is an empirical fact you don't seem to be interested in acknowledging.

You "merely relaying how the field of biology defines sex" is disingenuous because your position on the whole matter is not inquisitive (in search of understanding) but authoritarian (telling others how to be).

That's why you will be called out on it repeatedly, because you are not telling the truth about your motives and try to pass yourself off as neutral and scientific.

So I ask you again: Why do you care so much?

The answer is pretty clear - you don't acknowledge that you yourself are trans, because you haven't developed the self-reflection skills to be honest with yourself about it yet. Instead you cling to biology text books, while telling trans people that they don't exist.

But we know your type very well - dishonest, mean-spirited denialists with no personal integrity.

Your power struggle is with yourself.