Question

when an oppressor uses race to determine who is and is not privileged, means what stereotype, or etc

Answer 1

Your question doesn't make sense. Please clarify.

Answer 2

I am also not certain about what information you desire. Here are some articles related to prejudice.

http://www.members.cox.net/dagershaw/lol/Prejudice.html
http://www.members.cox.net/dagershaw/lol/PrejudiceCauseSolution.html
http://www.members.cox.net/dagershaw/lol/PrejudiceUsThem.html
http://www.members.cox.net/dagershaw/lol/PrejudiceChanges.html

I hope this helps. If not, repost your question more clearly. Thanks for asking.