Also I think it's worth noting that you probably see higher rates of transgender kids in more progressive households... Not because they are being influenced necessarily but because those are safer environments for trans kids to be themselves.
Transgenderism seems new because our society wouldn't accept them in the past -they would either need to hide it or get the crap beat out of them or kill themselves
For people balking at the age of kids transitioning at 5, 6, or whatever else someone determining what's too young, I'd offer that is definitely better for a person to figure this out earlier in life than much later. First of all, if it's just a curiosity or something that a kid will "grow out of," which is a joke, but I'll play along. What's wrong with actually letting the kid grow out of it while prepubescent? If the daughter of gentleman in the tweet decides at 10 that this isn't for her and she wants to be he again, then what's the issue? What's the harm? Kids are going to tease him because he's living as his birth gender?
I'd imagine that nearly every kid who transitions, does it, or some nebulous form of fluidity, for the rest of their lives. You think it's easier to make this transition in Kindergarten, 1st, 2nd, 3rd grade, or in middle school, high school, college, or in the workforce? This answer is very obvious, right?
I'm trying to not pass judgment on this stuff, because how hypocritical would I be, right? But man, it's so easy to just listen to people with experience and let their experiences inform your thinking. Every single "I don't get" or "that can't be true" is directly related to not having that experience and then not believing those that do.