I'd generally support whatever it was that they wanted to do. I am already of the mindset that everyone has gender roles way too defined anyway. We are all humans, works for me. If my kid wanted to be male, female, a horse, whatever floats your boat.
I'd obviously try and guide them in such a way as to avoid them dealing with the likely negative reaction of a lot of ignorant folks but in the end, they know themselves better than I do. That said though, a lot of people don't actually know what they are, or what they want, at that age. They tend to grow out of phases. However, I'd still support it to an extent. If we are starting to talk things like hormones, and surgery though. That would require a lot more discussion as making permanent decisions like that when you are still a clueless teenager is not ideal.
I'd obviously try and guide them in such a way as to avoid them dealing with the likely negative reaction of a lot of ignorant folks but in the end, they know themselves better than I do. That said though, a lot of people don't actually know what they are, or what they want, at that age. They tend to grow out of phases. However, I'd still support it to an extent. If we are starting to talk things like hormones, and surgery though. That would require a lot more discussion as making permanent decisions like that when you are still a clueless teenager is not ideal.