You won't get better service – that's my point, the next guy who sounds like you will. If people who look and speak like you tip disproportionately, everyone el

You won't get better service – that's my point, the next guy who sounds like you will. If people who look and speak like you tip disproportionately, everyone else that looks and speaks that way will get great service by default, even if they don't tip, at expense of everyone else now getting bad service. This of course doesn't apply if you are a regular, feel free to do whatever you want. The staff will treat you well because it's you, not because of the stereotype your accent implies.