The idea behind keeping men out of women's spaces is for women's safety and not to stop dads from helping their daughters.
Could he have taken them into the men's room? Yes, but they may still be exposed to male genitals.
Could he have had the store close one of the restrooms or stand at the door? Yes
There were other ways to do this, HOWEVER, the other guy was WAYYYYY out of line. Calling the cops and flipping out once you realize the father isn't being a pervert is crazy.
A father takes his daughters into a women’s restroom during a road trip, leading to a confrontation when another man demands he leave and calls the police 😳