> ...those things are blamed indeed, but for society's problems, not their own.

That's a good point in some cases. But in many cases that doesn't hold. Meryl Streep outgrouped popular, middle American, and "lowbrow" culture(s) when ranting about how they impact on her job. Gay marriage and abortion views are certainly personal complaints as well as social ones. Distaste for spiritual people typically stems from a personal grudge more than a dry academic philosophy about the social impact of disagreements about metaphysical reality or something. How about bikes versus cars disputes in urban areas? Or disagreements about Bay Area rent?

I can come up with more examples. I think there's a "I'm just being the rational one here" type of cognitive dissonance from basically all perspectives. Even that attitude holds the seeds for outgrouping (those irrational people!).