I have certainly seen enough of this sort of thing in, for instance, home-schooling groups (the Evangelicals and the Hippies often have more in common than just wanting to teach their kids themselves, but there is plenty to divide them, too).
But the limitation I see on this is that you wind up supposing that you can just have an affinity group for every little interest and subdivision thereof, and have no need of a larger "community" or even of an encompassing "nation" or "civilization". This is the fallacy that Ayn Rand embraced (or rather, tucked under her arm and ran with, full tilt).
There is, indeed, such a thing as "the wider [ ] community". We just need to keep in mind what it is, and what it isn't.