I'll definitely check for signs of this next time I'm feeling epistemically self-righteous.

A friend of mine likes to say that, if you find that your personal opinion happens to align perfectly with what popular culture tells you to think, you should examine that opinion really closely to make sure it's really yours. It's a similar heuristic to the self-righteousness one, applied specifically to the first-level or "uninformed" position (since "uninformed" is really a lot closer to "only informed subconsciously, by local culture and media").