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Haha, no it's not a saying. It's a reference to the quote i opened the article with :-)

I have in the past made important decisions about people I work with, agents and producers - big decisions based largely on how they treat the wait staff in the restaurant we're having the meeting in. I don't care if you're the most powerful cat in the room, I will judge you on how you treat the least powerful. - Tim Minchin

When someone serves me a drink I say thank you, and if I have anything to complain about, then I do it in a respectful manner.

I've often witnessed that those lines start to blur the more power people do have. Then thank you suddenly seems to be such a big deal.