Are we supposed to pretend that an teenage boy is a girl just because the parents convinced him of that when he was a toddler?
Who said the parents convinced the kid of anything.
Show me someone, anyone, someplace, somewhere, anywhere that changed their gender definition because their parents convinced them to do so.
For one, I did, but I am far from the only one. There is no way an 18 month old would be self aware enough to be able to determine that they were in the wrong body unless they were taught to believe that by an adult with an agenda. Believing otherwise would require extraordinary evidence because it is an extraordinary claim.
"an adult with an agenda"
is rank speculation on your part. Nothing more.
Your claim that a parent has something other than the best interests of their child is absurd and based entirely on your own agenda.
Look in the mirror. You are the one with the agenda based on nothing other than media reporting.
You do not know those folks and you are judging them on nothing other than your own political ideology.
Your agenda is at work here, nothing more.