The bit that baffles me on this stuff about who gets to use the loo is that if they don't know and the person needing to use it is not saying, how do they suppose they'll know?

There are separate cubicles and we're not usually labelled!

Perhaps the extremists believe we're all 6'7" and hairy?

Then again, perhaps they feel it their right to challenge every tall, homely or non 'feminine' non obviously binary ciswoman? That could get interesting.......