My child told me how they felt probably 20 years ago now, so it was long before trans becoming what it is now.
My child was also the first trans pupil in our area, so that's why there was so much pressure, the school absolutely thrived on it, and even advised other schools based in being the 'first' in the area to deal with a trans pupil (despite us not wanting any kind of special treatment or interventions, just literally private toilet and changing). It was just awful.
When my child hit 20, and were still adamant in their feelings (after 5 years of private counselling, and 15 or so years after telling me this was how they felt), they did decide to go down the route of hormones/surgery, fully supported by me.
My child is happy, healthy and thriving, though we homeschooled my child is now doing their second degree, putting themselves through university, working hard and is just a joy. None of that would have happened if the school had their way, they wanted to push interventions that my child wasn't ready for, for their own reasons.
I would, obviously, rather my child didn't feel this way, I would rather they were happy in their own body and didn't have to go through all this to be happy, but, sadly, it didn't figure out that way.
Sometimes it isn't just as easy as "I've told my child toys and clothes don't define gender" so the smugness of some who think that's all you need to do is really irritating. Nothing in my home, with any of my kids, has been gendered, and yet this still happened in my family.