I recently took my niece to a doctor's appointment. She's 4. She was wearing a knee-length skirt (and was wearing shorts underneath) and playing on the ground with other kids in the kids section thing they have in some waiting rooms. This older woman comes by, taps her on the shoulder and sternly says "now that's not how ladies behave, you should sit in the chair with your legs crossed while wearing skirts, that's how you act."
Quite a few people looked at me crazy when I responded to her, "she's four years old for fuck's sake, and she's not your child so mind your damn business." I was just shocked that she really said that. And my niece was so embarrassed omg I was pissed.