Had an interview recently where a professor was blatantly racist in one of the group settings. I don't want to give too many details that may reveal my identity, but I confirmed that it was not a misunderstanding. Other people looked shook too, but I think we were all uncertain about what to say and didn't have much time to act. I want to withdraw my application and say something about it, but I'm not sure exactly what actions to take. Any ideas?