Ultimately it doesn't matter how you tip unless you frequent the restaurant. Your service will be a result of the people who looked you and came in before. So

Ultimately it doesn't matter how you tip unless you frequent the restaurant. Your service will be a result of the people who looked you and came in before. So white, wealthy looking people will generally get better service by virtue of being white and wealthy looking. Doesn't matter if they skimp on the tip. It's very racist and classist in practice.