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So the Red Indian is bad but the Pilgrim is okay? - because the article implies they've both been offensive in their choice of outfits.
I think that the Indian/Pilgrim combo actually makes it less bad than just dressing up as an Indian, or a cowboy/Indian combo. In this case you have a sort of social historical comment, rather than just a single reinforcement of a cultural stereotype.
So the Red Indian is bad but the Pilgrim is okay? - because the article implies they've both been offensive in their choice of outfits.
Also, would an Italian dressing up as Jesus be bad, given that he was crucified by the Roman authorities and early Christians were thrown to the Lions?
[As an aside, a good few years ago a friend of mine went to a party dressed as Jesus, and he said the women there were all over him!]