When someone asks if you are male or female, 99% will interpret it as "do you have a penis or a vagina?", not "do you identify as a man or a woman?", nor any other
You seem to suggest that my interpretation is arbitrary, while I think it is the most colloquial. Do you honestly think that a 15 year old girl/boy would see this thread and think "well I am neither of those"? Or are you just deconstructing a very straightforward question by its edge cases to prove some kind of point that I'm missing?
I think my point is more along the lines of "no matter how you ask it, someone is bound to be unhappy, feel discriminated against, etc". I know at age 17 I was not comfortable saying "I am a woman." That meant something to me that I felt I had not yet attained. I suspect minors mostly feel left out as is, just like transexuals feel left out in a thousand subtle ways by all kinds of linguistic implications that there is only male or female.