My assertion is based on purely anecdotal evidence of my own experience and what I hear from other non-gentile visitors to or inhabitants of Europe. One of my former students, a Moroccan, who lives in Germany told me that he's learned to speak english when meeting people in order to get treated as an American instead of a Turk. I've repeated this story to a number of white european liberals and always get the same hostile response. None of the jews/arabs/turks/africans in Europe I've told this story to finds it at all surprising.

I also base it on the very angry defensive response here to criticism of Jostien Garder's anti-semitic op-ed.