Well said, Shambles.

It means that if you continue a racist conversation, you are a part of that conversation.

Thats why you have to speak up and tell the racist that you consider that a racist (or sexist or...) remark. If they want to argue, you excuse yourself and walk away. It means standing up for your beliefs.

Thats why I won't respond to Gurney who wants to believe that Germans and Scandanavians are a different race of people.