I think the explanation is simple: Racism and prejudism cuts across all raical, ethnic, gender, religious, sexual preference, political affiliation, and any other category one could belong to. It is not limited to white people or christians. (And I don't know what to think after seeing that disgusting photo about the pope - while I was raised Catholic but no longer consider myself one, that was about as racist, prejudicial and unacceptable as it gets and would certainly hope that such is not allowable here or worse, encouraged.)