Granderson is criticizing the street-thug persona Kimbo protrays and making a point, not being racist. Cmon guys, read past the buzzwords for a minute here. What he's really upset is that Kimbo is exploiting (and therefore perpetuating) a racial stereotype. I'm not saying I fully agree or even care but let's not confuse his meaning here.
Why doesn't he attack rappers then? They project racial stereotypes which people buy into willingly, judging by record sales alone.