Great article. I never heard of the grey rock method, but it reminded me of a parenting book I read many years ago, "How to Stop the Battle With Your Child."
The book teaches that children crave attention, even negative attention. If a parent can stay calm and not react emotionally, the child gets bored with a particular bad behavior.
BTW, if this were written by (fill in the name of a mega popular writer), you would have 20K claps instead of 200).