One of the first things to understand is that for minors, there's very little pharmaceutical or surgical intervention.
It's mostly social, and carefully monitored. The people involved in this know better than you that children are whimsical to say the least.
And, as much as you may like to think libruls are destroying the social fabric of America, the fact is that a child that chooses, with guidance, to socially transition will have to balance their internal happiness against a mega shit ton of people who will socially isolate and abuse them, from other kids to adults. And that's a decision that a child can make, and reverse, validly with proper support.
Puberty blockers are sometimes used to halt development of secondary sex characteristics until the child reaches majority or passes through any possible "phase." They have relatively few side effects and certainly don't destroy the reproductive system. They were designed for the cases of 8 year olds growing big tits, hairy chests, and big dicks and have a 40 year track record.
The people involved in this are not letting 13-year olds have sex change operations because they think it's cool this week, despite what your political allies tell you or want you to think.
When I come across stuff like this, I remember and want to remind people that alcoholism was universally considered a moral defect or lack of willpower until the latter 20th century. For all of modern medicine's flaws, it doesn't really tend to embrace some "flavor of the month" in social or scientific thinking, the relationship between serum cholesterol and eating cholesterol-containing foods notwithstanding.
Yeah sure, this 50 gender identities seems laughable at first, and any notion of letting minors have sex-change operations is problematic to say the least. But, if you're not willing to dig a little deeper into the facts of it and consider that this can be a huge issue for people, then I don't really know what to tell you, other than you should "check yourself before you wreck yourself." Analogiing this to kids wanting to eat skittles for breakfast is pretty appalling.