Some terms, I don't care at all for.
"Reverse discrimination" is okay as a legal term. The majority person/people lose out on an opportunity because of some ruling favoring the minority. But to say that people in a minority are guilty of reverse discrimination because of their racism/prejudice toward the majority, NO.
"White trash" is a term used by white people for unacceptable behavior or lifestyle of white people, also often called "trailer trash." The problem with "white trash" is that it suggests that such behavior would be okay for either black people or foreigners of some kind, but "we" should know better. I never call anyone "white trash" and there is plenty of people in my own family that would fit the bill for that description.
Relating to the posted topic, I heard plenty of whites call someone in the territory "White trash" right in front of their black field service partner.