That dad made the choice to ignore the discomfort of grown women (if there was any) to instead focus on the comfort of his daughters.
I am totally ok with that.
Got sucked into the debate on the dad with his daughter in the women's bathroom.
He should have taken her into the men's bathroom, full stop.
And for all the people saying they would never want their 3-year-old daughter in a bathroom with men...
The stalls have doors, you know. She's not just on display.
Fast forward a few years, and your same logic holds with the opposite effect.
Imagine that your daughter is now a teenager.
Do you want her in the bathroom with a bunch of men, just because they happened to have their young kids with them?
By the logic people are using, you have to pick a poison. Except it's not really a poison because the kid is behind closed doors!