If he’s on here, I have offered to give him the evidence about toilets. I have also tried to engage on other types of social media in the past. He hasn’t replied.
Ironically his sentence is right as technically the right ‘bathrooms’ are the men’s. I can’t find the evidence either because the negative effects come from them using the women’s.
As I keep saying, I want to keep everyone safe. The design for single sex toilets is most likely to do that. But as soon as there is any ambiguity, the designs become mixed sex, which makes it less safe for everybody.