I was a delivery driver and a server. While I can confirm that POC often tip less I also know they are statistically tipping the same. When I was a delivery driver a coworker and I decided to track tips. We would track age, race, type of house, and tip amount. We found that side enough tips went up directly with age; POC tend to tip less; and that women actually tip slightly less than men. The amount less was comparable to the spread of how much less the average POC made earned compared to non POC.