Every girl there is being made to accept a man watching them change. It is being drummed into them that when a man says they are a woman they have to accept they are.
How far are we actually going to take this as a society? Will we get rid of courts and judges, because if somebody says they didn't do what they are accused of, we have to just accept their innocence? Will squatting become a thing of the past, because if somebody says they are the owner of your house, we just have to accept that they are? Anybody can buy alcohol, as long as they say they are over 18? Making people take driving tests is offensive bigotry, because if they say they can drive competently, how very dare anybody gainsay them?
Those in power - and others who blithely accept this 'fiction is truth' narrative really need to stop for a moment and think about the principles they are wading in and signing us all up for. There will be no such thing as a lie anymore: we will merely have 'truth' and 'equally-valid truth'.