Shouting: the new spanking?

At what point does the inverse become true: instead of coddling these future adults who "suffered trauma" because "mommy yelled at me when I dropped a plate once. I was 8 and never got over it." and making them feel their neuroses are justified (by a BS psycho-therapy industry that cares more about self-propagation than mental health), we start telling these thin-skinned nit-wits that THEY, not their yelling parents, are the problem. In fact, why not yell? Those sound waves might even get through their thick skulls!