<human>: Can you condense the text into three sentences or less?

Okay, so I was out at the zoo a couple months ago and someone else's child grabbed our stroller and started running around bumping into things. His mother was following him around saying "no thank you!" I was very confused by this but passed it off at an isolated incident in an eccentric family. Then about a week later we were at a playground and there was this kid who ran around pushing all the other kids down in the sand. Two adults were taking turns saying "no thank you!" each time he did it. This was not the same kid as before.

Ever since then I feel like I've been hearing it everywhere. Any time we are out in public in a kid-friendly area there is at least one parent saying "no thank you" when a kid throws things, hits someone, etc. I am genuinely confused by this because my understanding of the phrase "no thank you" is that's what you say when someone offers you something and you don't want it. I feel like these people are speaking a completely different language. I know everyone has different parenting styles and I'm not trying to criticize, I just honestly do not understand. Can someone please explain this to me?
<bot>: Why would a parent tell their kid "no thank you" when they are misbehaving? Can someone please explain? I'm not criticizing, I'm just confused.