Sex should be based on what chromosomes you have simple as that really, DNA is one of the greatest scientific discoveries in the history of the world we should use it. If the argument is that gender is not the same as sex then change all forms which ask ones gender to sex so there's no confusion.
If people want to 'identify' differently to what biology/science says they are let them but we shouldn't have to bend over backwards for a tiny vocal minority who act like dictators.
If people want to 'identify' differently to what biology/science says they are let them but we shouldn't have to bend over backwards for a tiny vocal minority who act like dictators.