Advice
Treat people how you would want to be treated. Don't treat people differently because of the color of their skin, the way they talk, or the clothes on their back. You might not always be tipped well, but there isn't just one demographic who doesn't tip, it can be anyone. Also, don't track your tips throughout the night. There is no need for a bad tipper to have to ruin your night before it has even started. It makes it extremely difficult to keep a positive and welcoming attitude towards other guests.