If as you have intimated we ( white men ) might be adjudged racist for condoning his fancy dress, then why wouldnt we feel we have a stake in the debate ??
I doubt anyone is really offended, its not offensive.
I think we just have a noisy minority that subscribe to the unwritten code of modern fancy dress, no Adolph Hilters or 'Blacking Up', there doesnt seem to be anything worthwhile in their ramblings about slavery, oppression whilst a sportsman...