Now we are into the territory of assuming that people *are* actually offended by something but they just don’t want to say that, for some reason.
For my money, the sooner we can all collectively put the past behind us and stop tiptoeing around certain topics because of something that happened a long time ago, the better.
You can make a joke about dozens of personal characteristics, but the second it touches on skin colour then there is uproar, purely due to the historical context and because one persons ancestors massively abused another’s.
Everyone can see that slavery and various other things that happened in the past were incredibly wrong and awful, it’s time that we as a society moved on from it and stop branding any sort of reference to a skin colour as racist.