It's gone a bit too far now though. I mean, previously it was just a polite fiction to assuage the mental anguish of those who feel at odds with their sex for whatever reason. Now we're all compelled to actually believe it, in all situations. Or at least, convincingly act as if we do.
The honest answer is that I've not yet heard any convincing argument that would cause me to accept this as a reality.
Perhaps this is partly because I used to be a biologist and worked in the medical research field for a while (before pivoting to software development to get out of academia), so I have a very critical eye when it comes to the studies that proponents of this set of beliefs tend to use to support their arguments.