I think it is important to speak up when you hear those remarks. Keep it simple,such as I don't want to hear that. They aren't going to change their thoughts. There is a quote by Elie Wiesel: "When good men do nothing, evil continues." I guess staying away from them as much as possible is important, also. Don't engage in a conversation, or argument, just simply state you won't stay around to hear that. They know how you feel, and I think enjoy making those racist remarks....people like that love to get someone going and arguing. Racism has always existed, and sadly always will; all we can do is when we hear it; say something.