I am presuming you are ambulant and are a woman, (but if not then just substitute the word woman for man):
Imagine you were at your most vulnerable in a toilet cubicle - perhaps going there feeling ill, then it turning into a medical emergency. Another woman entering the single sex washroom would be able to see or hear you were in trouble in your cubicle.
That safeguarding feature gets taken away when toilets are in a mixed sex environment. The toilet design has to be resistant to sound and floor-to-ceiling in height.
I think the right to a safe toilet design for ambulant people having an emergency, and for those with disabilities and conditions such as diabetes, allergies, epilepsy, heart conditions, stroke, should come before toilets becoming completely private. This means certain single sex designs are inclusive of disabilities as a very reasonable adjustment.
These conditions don’t ‘care’ what you identify as. I want safe toilets and this means a certain design that can only be used in a single sex environment. I want toilets to be clean and not smell and that is supported by certain single sex designs too.
If you feel unable to use the women’s toilet, the accessible is the next best design. It has an alarm pull cord and opens up directly on to a main thoroughfare, both safety features. This design relies on the occupant having the ability and desire to get help for themselves by pulling the cord. Now as an ambulant person you can help by making sure the cord has been left untied and reaches the floor. You can make sure the toilet is left in the best state for the next person who may not have the same capabilities to do this as you.
Options if you want men and women to be able to use all toilets:
Change all toilet provision to be the correct regulated design for a mixed sex environment. This isn’t economically and practically viable, or justifiable for health and safety. It discriminates against women, elderly, children, medically vulnerable including some disabilities and those with certain religious beliefs. This seems to be the preferred option of the Good Law Project - they called this the ‘sophisticated’ solution for the consultation for Keeping Children Safe in Education.
The other option is to change the building regulations and standards and legislation so men and women can be in designs made for a single sex environment. The Sexual Offences Act would need to be looked at because there’s certain sections involving toilets, because they are vulnerable places.
Which option do you want to go for?