Is it bad to act like a child (sometimes)?

So, today I didn’t have school because it snowed (YAYYYY) and I went out with two of my best friends. It was soooo cold. Anyway we played and played and played till we weren’t able to move our hands (you know you need your hands to throw snow at your friends’ faces) and then we went to a store cause we wanted to buy something to eat. And the girl who works at that store asked us if we were the ones who were playing outside and the bad thing is that she asked like she was talking to 5-year-olds. I mean, can’t we act like kids for some hours and then be us again? We played like we were really stupid, okay I know about that. But it doesn’t mean that it’s bad to have fun with your friends when it snows, right?