I was considering making a text post along these lines just now and then I saw this! Yes this echoes my thoughts exactly. A large number of the trans rights brigade online are virgin children who think they know how sexuality works better than adults. And it's so frustrating because their devotion to absolute inclusiveness is well-meaning (Geek Social Fallacy #1, anyone?), and they simply don't have the sexual development and life experience to understand why sexuality doesn't work that way, or what it's like to be a woman in a man's world and why women might not feel safe letting males self-identify into their safe spaces (hell, as a gay adult man I don't understand what life is like for women, but it's clear enough that it's tough). These children's real-life contact with trans people is probably limited to seeing their trans school friends struggling to fit in and feeling sympathy for them.

That's not an excuse though, just an explanation of why I think they aren't worth arguing with. They're literally incapable of understanding the opposing viewpoint. Not that the adult TRAs on Twitter are much better.