"And I really fail to see how insulting a client is a imperative for good mental health :)"

Heh, you've obviously never worked in retail. :) Stand behind my counter just one week and you'll see what I see. :)
When I say if you get stepped on often enough to want to step back...I mean I've been stepped on often enough. Often enough to warrent my opinon of customers who walk through my door, leave messes for me to clean up (usually next to a half empty garbage can), are rude and inconsiderate and act like my business is public property and I their own personal servant expected to jump when they snap their fingers.

Oh yes....it's therapy alright. :)

...... Kendra