Reminds me of a scene in Uncle Tom's Cabin. There's this black slave girl, named Topsy that does all sorts of bad stuff, and this white girl named Eva asks her why she does what she does, and the black girl responds something along the lines of "Hey, Not like people expect better of me" Just found it odd; Was never expecting to be reminded of that scene today, or this year, or ever. The human brain is really quite interesting. Eva shows Topsy some love and forgiveness, basically treating her like a human being, and Topsy turns for the better. Responding to poor tipping with poor service really doesn't seem like a good idea.This causes a feedback loop of a garunteed bad tip and terrible service for the next group of Black patrons who will in turn not tip for shitty service.