Hey, didn’t your parents teach you it’s impolite to stare? Nobody likes being stared at, and this person decided to take their frustration out on a child for staring at them in front of his mother. You must start them young; you know. Teach them valuable life lessons right out of the gate. But also – he’s a baby. Let’s maybe avoid yelling at babies.
He didn’t know any better. Perhaps this person had mustard smeared all over their face. Or ketchup, we love all condiments here. Regardless, it’s never good to discipline someone’s child while their parent is right there. Leave the parenting to the actual parent. That’s generally a good rule of thumb.