While this stuff is interesting, the core of the issue is people caring far too much about other people's innocent behaviors. I personally don't care how someone chooses to identify themselves. So long as they can function reasonably in society without harming anyone, it doesn't matter. Anyone who can't accept this is overstepping their bounds by any metric.
What right do you have to dictate how much other people are allowed to care about issues?
Regardless of how misguided their feelings may be, the fact remains that a very large number of people feel uncomfortable around people who are different from them. Certain differences must be tolerated for practical reasons due to large numbers on both sides. However when it comes to gender-fluid identities, there are a large number of uncomfortable people on one side and a relatively small number of uncomfortable people on the other. So why must the many be uncomfortable so that the few don't have to?
Because there's no practical justification for enforcing one's sensibilities on another's lifestyle, absent that lifestyle's tangible detriment to anyone else.
This is the ideological underpinning of the U.S. legal system and much of western political philosophy -- "Your rights end where mine begin".
And your concern about a large number of people suffering discomfort for the sake of the few is a perfect case example of why so many (myself not necessarily included, but I'm going to use the argument here anyway) consider it so important that the USA is a democratic republic, not a pure democracy, because supposedly pure democracies result in a tyranny of the majority and angry mob overrule of the interests of innocent minorities. Exactly what you are describing is at stake when you say that the many are suffering discomfort from exposure to lifestyles of a few that they consider distasteful.
Discussion about the biological vs socialized nature of gender identity is academically interesting, but politically irrelevant. Because whatever the answer is, so long as someone can function in society without harming anyone, their personal paths of self-discovery and lifestyle choices are their own to make. Anyone who says otherwise is advancing the issue from an offense to their own personal sensibility, which is not the same as an infringement on their freedom, to an actual tangible infringement on someone else's freedom. This flies fully in the face of every value our culture and political system claims to be about. Not that slowly unraveling such hypocrisy hasn't pretty much been the story of this country's history.
Freedom does not mean freedom from ever being weirded out by anyone, and anyone who acts like it is doesn't deserve to ever say they believe in the word.