In places where unisex bathrooms is the norm, it not that uncommon to see men's only bathroom while the other rooms are unisex. Is that discrimination?
I'm rather curious where this is actually the case, particularly as you claim it's not uncommon.
My experience has been the opposite, though I'd hardly claim it to be representative. My prior employer had all single-occupant, unisex bathrooms originally, until one woman high up the management chain demanded there be women's only bathrooms. So, a women's only placard was placed on a couple of the unisex bathrooms, and suddenly, guys had to semi-frequently wait on for the remaining available unisex bathrooms during the day.
It was very clearly discriminatory, and I have no problem claiming the reverse would be just as bad.
If I generalize a bit for Sweden, small restaurants and shops generally only have a single bathroom. Fast food restaurants, schools/universities, work places, and train stations tend to have one or two large single-occupant unisex accessibility room and several smaller single-occupant unisex rooms. Airports, high-end restaurants and shopping malls tend to use US style of single-sex bathrooms. Tourist areas, venues for people to drink, larger gas stations, and bus stations often come with a urinal room for men-only, an unisex accessibility room, and one or two smaller unisex rooms.
The larger accessibility room is also for parents with small children.
Yes unless there is almost same amount of male only bathrooms. As member of most hated minority I can accept that there is correspondingly to population less bathrooms. So 51% of bathrooms should me female only and 49% of them should be male only.
this is actually an interesting problem for building designers, because the "fair" scenario of equal space for each ends up in too few female restrooms (assuming a natural split of clientele) because the men get urinals which can be packed in like sardines, the women don't.
Even if you go "fair" and have the same number of drains regardless of size you often end up with lines for the women.
Most large place compensate by putting in way too many toilets on average or just hope there isn't a crush-time.
The best place to see this in action is at a stadium with 50/50 fans during half-time or other break.