I think this is more a matter of tact than anything. People with good social skills know that constructive feedback demonstrates authority and skill better tha

I think this is more a matter of tact than anything. People with good social skills know that constructive feedback demonstrates authority and skill better than condescending feedback. Those who are prone to condescending feedback especially know this, but lack the grace and tact to act on it. That makes them more anxious and more insecure, which in turn increases the lashing-out behaviour. I think the sad fact of the matter is that many geeks just have poor social skills. While some are content to just be quiet, others feel the need to overcompensate. Luckily, I haven't met too many of the latter in real life, but you see it everywhere on the Internet. The dehumanizing nature of interacting with a computer screen seems to absolve people of their need to act socially, so they act like fuckwits. On 4chan it takes the form of blatant aggression, although anyone familiar with the place knows it's all part of the joke. On reddit people make snarky replies that make up for their lack of content with the sharpness of their barbs. Here on HN it's more muted. While no one is a blatant asshole, there's a lot more "downvote and ignore" that goes on. This contributes hugely to the hivemind effect, because there aren't arguments given as to why someone is wrong, you just have comments that don't jive with the rest of the community getting hidden. This, in turn, causes people to self-moderate, so that they only post opinions they think the rest of the community will agree with. Obviously these are oversimplifications, and the issues I mention aren't particularly common, they're just how the same issue manifests itself in the different communities.