Has any body else experienced this, what's your opinion?
I've encountered this for years, especially in US sports arenas and airports. I'd rather have my male privacy, and don't believe in a double standard. I've never heard of a woman being arrested for going into a men's room, but gawd help the man who goes into the women's.
One problem women face is with older sports arenas, that were designed with an assumption about low female attendance versus male. But that older model doesn't apply today, with more women attending sporting events.
The men have adequate facilities, and typically spend less time in the restroom taking a quick whizz standing at a urinal. A women's restroom visit takes longer. And so you'll see women lined up down the hallways, waiting to enter the ladies room. If they're about to wet the floor I can understand them heading for the mens where there's little or no waiting.
I remember when attending baseball in the old King Dome in Seattle that virtually all the stalls in the mens rooms would be occupied by women. Fortunately the urinals were in separate rooms, so the men still had some privacy. (Though not from each other. The urinal was a long continuous metal trough, along 3 sides of those large open rooms, and you just lined up shoulder-to-shoulder to watch the piss stream of the guy right next to you. And listen to it. Those stainless steel troughs were very noisy, like rain on a metal roof)
Another restroom situation where I've encountered women has been in airports, and fairly recently. I'm not sure why, but I'm guessing it's once again a matter of inadequate capacity for the women. The architects really need to consider that a women's restroom needs more space for the larger stalls vs. urinals, and the longer time women spend there. Instead the blueprints will usually show mirror-image restroom spaces for both sexes.