I don’t like the override the hand you were dealt with/technology argument. That’s an argument for people not to get lasik, not to fix the deaf and blind if surgical options or artificial are available, to ban adhd meds, to not repair cleft palates or do plastic surgery, hgh, tattoos, liposuction of semiglutides, vasectomies and tube tying, artificial limbs and robotic replacements. The only distinction would seem to be you think all or some of these options are morally legit but transitioning is not caused by a legit medical concern so is just “a refusal to confront reality” followed up with the other moral pronouncement “wrapped in entitlement”. I note just a few years ago you could turn the gay argument on its head: God made you a man so why are you unnaturally attracted to other men. The only difference is you now accept one (gayness) as moral and natural but not the other. Again it boils down to in the end you are making a moral judgment call.
The best argument against transitioning under 18 is the consent argument. That the change is so fundamental a minor is incapable of making it and a parent should not. That assumes however there is a line of certain medical procedures over which we collectively believe the state and not the parent should make a decision (such as killing your child). But note such a policy does do active harm to people like that watfly illustrated. You are protecting some at the expense of others. It also concedes that a parent is not ultimate authority and the state can override a parent (say ca at one point considered screening kids for lgbtq and removing them from parents who might disagree).
As to men transitioning and then dating other men, the thing to understand is that not everyone thrown into the transgendered category is the same and therefore probably needs to be treated differently (progs did this to themselves). We have people who know from a very early age (like watfly’s person), people who know from a young age (most often associated with an autism link), people who transition later (tend to be males and straight and may or may not have autogynophelia link), cross dressers (both who may want to take the fantasy to an extreme and then regret it and most often associated with ocd and fetishers with no interest in transitioning), drag (gay men, usually for entertainment), and the nonbinary (overwhelmingly female).