The Oxford Etymological Dictionary of the English Language defined gender as kind, breed, sex.
It is not subjective.
Then along comes John Money.
If unfamiliar go have a read about the dangerously flawed and wilfully misleading pseudo science that was used to generate the 'new' meaning of gender and the reason why a new definition was necessary.  It is no mistake the new definition is one that attempts to normalize behaviour that cant even be repeated without a strong probability that police would be knocking on your door.
This ideology and thinking people must make no allowance because it is ideology, is dangerous,  duplicitous and all those who seek a safe environment for all of the people who are vulnerable must stand against it.