Racism in American basketball

I read this article about racism in basketball, especially about NBA. This article said that through the years of 1991 and 2004 every foul called by white, and black officials against all players of both racial heritages. It said that it was more likely than a black referee called a foul to a white player or a white referee to call a foul to a black player.
This is very sad because even in sports racism is present. But in the other side I think that in this kind of events (competition) racism is over-rated. With this I mean that every little aspect or disrespectfull action is seen as a racist action. Maybe it should not be always clasiffied as racsim, maybe is sometimes just a disrespectful action.