Once the blacks show up at a business, it’s doomed.
Either they are asked to abide by the rules, like everyone else, and stage some “boycott” type incident, like here.
Or they are allowed to take over and run amuck, running off all your other customers in the process.
It’s a a lose/lose proposition. As long as there are two sets of rules in this country, you might as well just start to close shop once you’ve attracted a sizeable number of blacks.