I would bet good money that almost none of those who dance border would have any idea what Blackface Minstrely was, when it was, who did it, and why. Nor would a vanishingly tiny proportion of the population - and the vast majority of those would be white people taking offence on behalf of minorities who also don't know and care less.

This accusation, that appears only here and sometimes on the MDDL list, is completely fatuous since it assumes some esoteric historical knowledge and racist intent. Neither is likely.