Ignoring, for the moment, that real biology is more complex than that: Messing with people's societal expectations has always been a part of the hacker ethos. Coming from a conservative background myself, I used to find this shocking, too!

There's a lot at stake and real biology is not more complex than that, excluding birth defects. I can appreciate youthful rebellion as it was also my MO, but the tranny movement are not cool biohackers, they are mostly utterly deluded youth being misled by irresponsible adults who are so afraid of being labeled bigot or transphobe that they have conceded objective reality to appease the mentally ill.