I wouldn't put it past NBC to engineer some 'bigotry' when they don't find any that is to their liking.
I suspect that they were hoping that Bill Lester would crash when he raced a couple of weeks back so they could create an issue. When he ran a good clean race they were probably pretty disapointed.
I took a black friend to the race at MIS with me some years ago. He was terrified and thinking that he was walking into the heart of the KKK. By the time we left he said that he had never seen so many friendly people. He takes his family to the races every year now.