It’s important because according to this article (USATODAY.com - CEOs say how you treat a waiter can predict a lot about character), it’s a window to your character. Maybe waiter is too specific - it’s how you treat anyone that is not of a higher position that you are. It’s normal for us to act all goodie-goodie when facing a superior. So if you feel you need to know someone, just see how they treat seemingly less important people.

Reflecting after I read the article, I couldn’t agree more.