Kaus goes the fanshen route, here, and admits that he might also have latent tendencies towards snobbery. From his argument, I don't see how any political advocacy could ever be separated from the tendencies he criticizes: we engage either in "Vulgar Marxism," where people only act in the political sphere based on their perceived self-interest; or "social inequality-based snobbery," where you attempt to convince others that you have a more refined view of what their actual self-interest is than they do.