Playing in the dark with a camera-based system is a problem for anyone. Of course ambient light conditions are going to have an effect. It's not as though human bodies are naturally luminescent. It might be worse for a black guy playing in the dark (though, more likely, it probably just doesn't work in the dark at all, no matter ethnicity) but it's hardly racist to point out that the darker a person's skin, the more difficult it is to see them in dark conditions. That's physics and biology, not racism. Otherwise why not claim that it's racist against white people if it has trouble distinguishing them against a brightly lit white background (my Eyetoy used to have trouble picking me up against my white-walled bedroom too, but I didn't ever accuse SCE of racism).