More people need to read this.

Another version:

http://pandawhale.com/post/15476/a-person-who-is-nice-to-you-but-is-not-nice-to-the-waiter-is-not-a-nice-person

"If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals" -Sirius Black

From Harry Potter?!

Also, not a smart person. Never disrespect the people that handle your food...

That is an excellent point, Courtenay.

My mother's advice to me: If you want to know how he'll treat you after you've been together for 20 years, look at how he treats his mother.

It makes me wonder why so many people mistreat their parents. 

This never happens; ever. Bad people are nice to waiters. LOL. 

It happens a lot.

But also, bad people are nice to waiters sometimes.

So just because someone is nice to a waiter does not make that someone nice.