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97.89.55.123
Since: Dec, 1969
Jeysie
Since: Jun, 2010
2011-07-29 18:44:04
^ You mean Blue-and-Orange Morality (although Green & Purple does describe a good Babylon Five example of the trope...)
Apparently I am adorable, but my GF is my #1 Groupie. (Avatar by Dreki-K)

You have two groups of people who are separated by differences that to an outside, objective observer are totally arbitrary (e.g. one group is red, the other blue), but which both groups are convinced opposes them entirely and eternally, even though they're really identical. It's a parody of partisanship and group identity.
I'm specifically trying to remember a specific literary/proverbial example of "black x and white x," where x is some nonsense name that isn't coming to me. It's driving me nuts.