"To the point that they think that they should be able to not disclose what their sex is when this is needed. It is the righteousness that literally and figuratively drips off some people that defies believe."
And this isn't good for anyone, it simply sets the scene for distress, anger and tension.
A pluralist society, which Britain claims to be, needs members of society to understand that seeking to police other's thoughts and expecting them to pretend they believe things they don't isn't acceptable. Even as a lefty, I blame the authoritarian left for this.
Butch woman and woman with PCOS would have a much easier time if widely accepted social convention (and the law) was that only natal females will use them. The assumption would be that facial stubble or masculine appearance need to raise questions. The same applies to potential sexual partners.