I worked in a small grocery store in California for years. The owners did not pay for the extra insurance needed to allow customers to go in “the Back”, where the restrooms were. We had a deli and ready to eat food, but were not required to provide a restroom or hand-washing facilities, because there was no place to eat inside the store. But, of course, if someone had an emergency, we all looked the other way. Better than us having to clean up after them! It didn’t happen often. But I agree, the Mom should’ve been better prepared. If the kid knew the word Diarrhea, there’s probably a reason for that...
You should see the Starbuck’s bathrooms in LA....homeless folks regularly lock themselves in to take a shower from the sink. I swear there are Greyhound stations with better facilities.