I remember hearing that you can't offend a racist by calling them racist and the more I think about it it's true. It only works when you're accusing someone of being something they're not. Like accusing an honest person of stealing, lying, fraud, or whatever - 'racist' is just the word of the day to use because it can hurt someone really badly wether it's true or not. It's going to hurt emotionally if it's not true and socially if it is.