As an anthropologist, this upsets me.

He's complaining that we're not celebrating our own culture and using theirs instead. Well guess what; if we celebrate it, then it's our culture too. Using Charlie Mc as an example, he studies Japanese martial arts and lived in Japan. He was immersed in and embraced that culture. That means that "Japanese culture" is now part of his culture. I play bagpipes, wear kilts, enjoy whisky, and speak Gaelic. It's my culture. I was raised in an American Celtic community and no Scot, Irishman, or Englishman will ever tell me that they have a monopoly on that culture.