Matt - I don't think the Nutters saying "we're not racist" would an iota of difference because those who choose to believe they are would not believe it and most other people proably don't care.

Les, racism as a concept did not exist in the 19th century so judging from a modern perspective is, imho, nugatory.

Lastly, I doubt many blackface morris know or care about minstrelsy and anyway why should they not appear as they wish.