Really, it's just Haskell. I've participated in pretty much every major FP community and the only place I find arrogance is the Haskell community. Never have I found any other FP community to be arrogant apart from an occasional programmer or two. But Haskell is different...non-arrogant programmers are the exception. And as far as I can tell, those that are not arrogant are also exceptional in that they have actually produced something of merit, like jgm for example.