There are number of selfish men who either can't stand the thought of women having anything for themselves, or pervert men who relish the thought of getting their dicks out in front of women who might be in a state of undress.
The only thing that's "changed" is that these men are now emboldened, instead of being rightly told to fuck right off.
They've been emboldened by the "be kind" crew, the luxury beliefs crew who never have to face it themselves, the perverts who've jumped on the bandwagon, and the people who've fallen for the "sex inspection at the gate" bollocks hook line and sinker.
If they want to make all of them mixed sex then they need to change the bloody signage to Pond 1, Pond 2, and Pond 3.
Of course, the men who want women to have nothing for themselves will be fucking delighted. The pervs will be disappointed obviously but they'll still be women to flash at I'm sure.
But some women will self exclude, and they'll fade away quietly, while everyone else is patting themselves on the back. Their world will get smaller and duller, and no one will care. Because a number of men wanted. And because they're men, they got.