The writer of the article is treating child rearing as if it requires PhD level child psychology. It doesn’t.

A child’s behavior is almost always ok if it is safe, non-destructive, legal, and NOT OFFENSIVE TO OTHER PEOPLE IN THE SAME SPACE. It doesn’t even matter if the other people’s idea of “offensive” seems reasonable or not. If their children are bothering others, a responsible parent will either curb their behavior or take them elsewhere.

The writer apparently doesn’t understand that last part.