Telephone installers didn't operate in teams. Life-insurance salesmen worked their collection rounds picking up payments. That the insurance man was coming upstairs was a dead giveaway by the sounds of coins jingling in his pockets. It's highly doubtful that racial discrimination can explain Domino's delivery practices. High crime rates in black neighborhoods can.
Crime imposes a hefty tax on law-abiding residents of black neighborhoods.
The insult associated with not being able to receive pizza deliveries on the same terms as people in other neighborhoods is just a small part of that tax. Children can't play safely in front of their homes. Fearing robberies, taxi drivers, including black drivers, often refuse to accept telephone calls for home pickups and frequently pass by black customers on the street. Neighborhood property values are lower as a result of crime. None of this is fair to law-abiding people.