This is really tricky. I say this as a father of a daughter who has always dated boys but two years ago informed us they were non-binary and preferred the they pronoun, and then last month announced they were actually trans, a word I was told no long meant transitioning to another sex, but could be used for anyone who no longer identified with their assigned sex or gender.
We are loving and accepting parents, but also occasionally confused and irritated. And we found out we are not alone. Among our peer group of parents who met during our kids grade school years, we know at least 8 children who have transitioned in some way. One teenage boy who fully transitioned by name and appearance to a girl, one teenage girl who fully transitioned to a boy (don't know about any chemistry or procedures) and by all reports they are happy and liberated -- feeling like their true selves for the first time in their lives. That's a huge thing.
But the other 6 kids, including ours, are a very mixed bag. When the wine comes out and the parents get all truthful, we admit that in some ways it does feel like a phase and perhaps a social trend. Adolescents and teens who have struggled with issues of identity and belonging since the dawn of time suddenly find there's room for experimentation and yes, a cry for attention that perhaps has little to do with a sense of gender misidentification, more to do with a dislike of social roles in general. Given this bold new category, groups of gender fluid friends are forming. The flavor of rebellion helps, even here in Marin County where parents are quickly learning how to openly support their trans children.
One of our best friends' kids transitioned to male and had started testosterone treatment. What made it painful for them was how he rejected his whole past life as their daughter --- hated seeing himself in old family photos. But they couldn't have been more supportive. Then their new son decided to quit the testosterone, started wearing dresses again, and started dating a boy. He's keeping his boy name and pronouns, but the situation is fluid.
I think we're being asked to accept that the situation is fluid, and maybe we can't keep up with all the changes to the nomenclature, which isn't really the point. But we'd still like a place where parent can consider the possibility these things may be phases or trends without being accused of transphobia.