Fittingly enough, the Rationalist community talks about this a lot. The canonical article is here ("I can tolerate anything except the outgroup").*
The gist is that if people are really different from us then we tend to be cool with them. But if they're close to us - but not quite the same - then they tend to annoy us. Hacker News people are close enough to Rationalists that HN people find them annoying.
It's the same reason why e.g. Hitler-style Neo Nazis can have a beer with Black Nationalists, but they tend to despise Klan-style Neo Nazis. Or why Sunni and Shia Muslims have issues with each other but neither group really cares about Indigenous American religions or whatever.
The gist is that if people are really different from us then we tend to be cool with them. But if they're close to us - but not quite the same - then they tend to annoy us. Hacker News people are close enough to Rationalists that HN people find them annoying.
It's the same reason why e.g. Hitler-style Neo Nazis can have a beer with Black Nationalists, but they tend to despise Klan-style Neo Nazis. Or why Sunni and Shia Muslims have issues with each other but neither group really cares about Indigenous American religions or whatever.
* https://slatestarcodex.com/2014/09/30/i-can-tolerate-anythin...