[AnimalMuppet]

I would put it differently. I think the episemological divide (or at least one of them) is between pre- and post-Hegelian views. Post-Hegel, real truth (in the old sense) is gone, and all that's left is a repeated cycle of dialectic.

What we're left with is that "truth" is only true within a society or group; I can have my truth that's true for me, and demand that you respect it. (I was going to say that this is what we're left with on part of the left, but on reflection the behavior you're complaining about on the right fits this pattern as well.)