You are right. That obsession with “blackface”, “cultural appropriation”, and the innocuous words denoting the absence of colour in languages other than English that far predate the founding of the #USA (ie, in Spanish, “negro”) is a distinctively American illness.
#Blackface can be innocent or even cute in many circumstances (why can’t a child dress up and apply makeup to emulate their favourite fictional character or historical figure?). But all context is ignored.
#CulturalAppropriation is an absurd idea; almost everything surrounding us is cultural, and every culture ever borrowed, imitated, and recycled all the time.
Again: “Obama fue el primer presidente #negro de Estados Unidos”. Get over it.