If we're banned from 'cultural appropriation' we can only sing/perform songs from our own background. I'm half Irish and half Scots, but born in London. What exactly may I sing? Certainly not Auld Lang Syne, except with the Scottish bit of me. And Cockney songs are forbidden unless I channel the London bit. 'Molly Malone'? Nah. Only if I'm in Irish mode.
This subject has been flogged to death on Mudcat, but blacking-up for Border Morris has been given the PC red card. Husband and I haunt the Morris Pottie Festival in Sheringham every year, he in his brightly-coloured African outfit. We asked for photos with one or two Border Morris sides, and they were so happy to oblige. But one lady whispered to my husband, "We aren't mocking black people you know. I do hope you aren't offended by our black faces?" He burst out laughing, hugged her and denied any offence. Later he told me he thought they were all bonkers!