There are better ways to debate than to question the person's race.
However, there have been situations here where a member puts forth viewpoints that consistently go against the purpose of this forum. This is particularly the case with opinions that ignore racism and basically says everything is the black person's fault. These tend to be views purported by whites and ultra-conservative blacks.
So while I think you do have a point, I can't say that I agree that race doesn't matter here. It does because it matters in this country... which is one of the reasons why the board is here in the first place. If you're black, then it's assumed you are on the same wavelength as the people here... if you're white then most would assume you're probably here to cause trouble, or to find fault with the black community.