[protomyth]

I don't think the skill is that rare, but I think the application of the skill is rare. There tends to be external factors which might lead a person to be angry which seeps into the criticism as rudeness. I think a lot of people can deliver blunt and direct criticism to a stranger in a cool, calm manner. It's dealing with the familiar people that makes it difficult.

I've watched my Dad do it and it also tends to shock the recipient when they expect some anger, etc.