I think there are two separate issues:
-
being accepting or non accepting of gender.
-
eroding single sex provision and protections.
Regarding 1), I propose being accepting of all varieties of gender. So accepting, that a multitude of genders becomes completely normalised for either sex. Protection for people's freedom to choose whoever gender they wish should be upheld in law. And single sex spaces should be made safe for people of any gender (belonging to the appropriate sex for the space)
Regarding 2) I propose single sex provision and protections should be upheld. But within that a multitude of genders should be catered for and their safety upheld.
So choosing your own pronouns, fine. Declaring your gender, fine. (Gender is indeed rendered meaningless once a multitude of genders becomes normalised for either sex) But eroding the protection provided in law for biologically female women, not fine.
I believe it it easier to uphold 2) if 1) is universally made acceptable. This is because the vast swathes of moderate people do not want to be discriminatory against any minority. Making a multitude of genders more acceptable and normative removes the controversy of gender - no one will feel silenced but the conversation will run its course as variety in gender becomes more common place and provision is made for this. Ultimately differences in gender will cease to matter.
Which leaves space for having a continued discussion about the safety and equality for biologically female women and upholding/making provision for this.