I actually have experience like that from my life 😃 at university there was this girl, i am friends with now- she weight 40 kg... and she is not underweight at all... Mind we are talking about country, not like Japan, where average height of women is 174 cm and around 55- 60 kg.
So she is tiny, and looked very young back then. So we went to the zoo together one time, and because i`m a dick, and i love when people get angry, when we were paying for the tickets i asked if i can get a discount, because i am with my daughter... My friend punched me in the arm...
And woman on the other side of the counter said that we can get family discount...
I was laughing my ass off whole time afterwards 🤣