Thank you for providing this information. I came across it, also, when I was researching this article but decided I would go with the researchers I cited. For several reasons: First, a "group" can include any number of people more than one. Second, a group can be very violently racist or just be engaging in bar talk. Third, the researchers I cited decided to include three measures for racism and did not include whether people had joined a group, and I was writing an article about racism by individuals whether or not they have joined groups.

All that said, do you believe it is necessary for you to try to label me as insane just to try to make a point? That seems counterproductive--and sad.