The cultural appropriation 'debate' has to be one of the silliest things to emerge in recent years.  I think the nadir (or zenith, depending on how you look at it) was when a year or two a yoga class at the University of Ottawa was cancelled - the white woman teaching it was accused of culturally appropriating yoga.  To be honest, that was when I first really started paying attention to this issue, but I realize now that it is becoming ubiquitous in intellectual/artistic circles.

As other commenters here observe, the whole thing is ridiculous, especially in this supra-globalized world our political leaders are guiding us to so fervently.  What the heck does someone think is going to happen when you have people from every walk of life and culture living cheek by jowl with each other?  That
one will not be influenced by the other?

Another first world problem, it seems.  We've got too time on our hands obviously.