They didn't used to be called "transgender." They were called "transvestites" or "cross-dressers," and you'd read about them regularly in Dear Abby and see them on Phil Donahue. 

What changed is that they're no longer treated as freak shows. Gender differences are now generally accepted as a valid expression of the human condition. 

There are still a few people out there, like Ted Nugent and Ron DeSantis, who think we we would all be better off if we were more like them, or at least pretended to be. 

These people are morons.