Man, she could have been more polite. Something like "I tried this, and I'm sure it's very good. May I have some (fill in the blank)...? She has enough money that she doesn't have to diss the sushi chef. Sushi has phenomenal freshness specs, and the chefs are highly trained. No wonder he was insulted. (BTW, I just LOVE sushi!!)

Seinfeld (Soup Nazi) immediately popped into my mind as well!