Yes, you are being a racialist. You're trying to point out the lack of people of color at Beck's rally somehow speaks about the race relations of the entire group in attendance - putting emphasis on race to interpret the event.

One of the great points Glenn Beck made is that MLK said people should be judged by their character and not the color of their skin. That's what he means when he talks about "reclaiming civil rights". Look up the definition of term. It's not even about color! It's the right to equal treatment of ALL people.