Racial tension in Glasgow

Here’s a link describing an incident in which Maurice Edu, an American playing for Rangers in the Scottish Premier League, suffered racial abuse from his own supporters, despite not even playing in a loss. According to the article, it was not the first time this had happened.  Having written about the Celtic-Rangers rivalry in my paper, this incident was not especially surprising to me given the racially tensionin Glasgow. However, as a  sports fan, it was amazing to me that supporters would do this to their own players; other similar instances have all been instigated by fans of an opposing side.