How "white"? How odd. I didn't know attitudes and ideas had colors.
But you are right, saying it's a "white" thing is racist of me. There are people of all colors who get trapped into this bullshit, as well as people of all colors who are not fooled by it.
I believe they might have been called "city-folk" at some point... maybe the equivalent of suburbanites or gated-community-dwellers today. Maybe saying, "that's a gated-community mentality!" would convey a similar meaning in a succinct and relatively PC way.