Gender is like planets. The category of "planets" (as opposed to e.g. planetoids) is socially constructed, but the IAU can still make a decision about whether Pluto is a planet.https://twitter.com/Aella_Girl/status/1146245121803005952 …
If we arbitrarily decide to place categories on a thing ("you must be x big to be a planet") and then decide if something counts as 'planet' based on whether they meet that thing, I get that. This doesn't seem to be the way gender works, though.