This really isn't the "gotcha" that he thinks it is tbh. Do people give a fuck if some fat internet neckbeard wants to take hormones and invert his penis? Largely, no. It's medically ill-advised (and also kind of hilarious), but being desperate to stop adults from doing dumb self-destructive shit is a quick route to madness. If a woman can get breast implants as big as her head, then so can trannies.
People mostly give a fuck that it's done on the taxpayer's dime, and that everyone else is expected to validate them and act like they're brave and stunning and biologically female. I don't have to pay for Miss Barbie's balloon tits and validate them as a life-saving procedure that is exactly the same as having naturally large breasts, and I don't want to do that for Kevin's neovag either. Have your cooms, because you're a big boy and can fuck your own life up if you want, but leave the rest of us out of it.