Fair play. Riff raff was a quick lazy choice. That said, one trip to Yahoo Answers - or whatever it was called - or similar and riff raff might be too kind. :)

Maybe we describe others as "less thorough and more emotional"?

To your point about HN, there's definitely - at least on some topics - a very narrow view; plenty of group think. Plenty of times, I've been down voted for not staying in line. Not for being wrong, or adversarial, etc. But for not thinking with the group.