Posts by members of minorities such as Martin Duffy and myself have pointed out that people taking offence on behalf of these communities is itself offensive. The presumption however well intentioned is in itself another form of discrimination. (Eric the Orange)

Exactly my point, and better articulated.

I am offended by the BNP. I am offended by some dancers' refusal to recognise that black-face plays into their hands. (Tom Bliss)

So does the censorship of it, which I find more offensive. Everyone has a right to be offended, and preemptive censorship on such flimsy grounds does nothing to alleviate racism, it is more likely to promote it.

Why did Richard the Lionheart get irritable when he saw Blondel coming to sing to him?