Biology is far more complex than most people think. Yes there is a bimodal distribution to gender. That doesn't mean only the two primary modes exist. The actual biology and other aspects are much more nuanced and always were. People transition to be more congruent to their own individual settings within that complexity. Pretending they don't exist and the complexity doesn't exist is ignorance at best as the evidence is overwhelming.

So learn a bit before you disown the lived reality of millions of people and give ammunition to those that would oppress them and deny their very existence.