The other inference is something I call math. If there are ten friends, and only one is a racist, then it is true that 90 percent are not racists while everyone knows someone who is. It’s that one guy.This isn't quite true -- if the average person has ten friends, and ten percent of people are racist, then the average person has one racist friend. But even if friends are randomly distributed, the probability that I have no racist friends is (0.9)10 or about 35 percent. And friends aren't randomly distributed. Most people tend to have people like themselves as friends. So the probability of having no racist friends is higher.
Still, it's a good point; we are not our friends, and our friends can believe different things than we do, and that's not a problem. (Incidentally, Barack Obama is not Jeremiah Wright.)