I wish they'd just include the tip with the prices or at least add a recommended tip to the amount, I'm sure not many would complain about 15%. I'm pretty sure some people don't even know that 15% is the standard or expected tip.
As others have said, it's pretty f***ed up that this waitress expects more from wealthier people than from others, what f***ing business is it of hers? We all pay for the same f***ing meal, don't we?
I really hope someone sues her for publishing a receipt with CC info.