It is not all "race" prejudice. Culture, religion and social stratum all get tossed into the mix. "Difference" is all that is needed.

Last year, a group running a prominent city-centre drop-in shelter and kitchen for the homeless campaigned for help. Those running it (tending towards the fundamentalist- evangelical in religions) asked for volunteers and additional donations. Help offered by the LDS (Mormons) was refused because it is a "deplorable cult."
The Mormons are a well-to-do stratum of society here, members involved in all aspects of business and service for well over one hundred years, both in the city and on the farm. I know there are many, like me, who no longer support that help centre, because of their attitude.

The point is that prejudices are many and complex, and affect us all. Racism is only one aspect of a general human failing. Obviously I am exposing some of my own prejudices here. Unconciously everyone who discusses the matter will end up doing just that.