Perhaps people on Less Wrong are less attuned to the nuances of social norms, and rather upvote/downvote based only on the content of the post in question?
The ideal of upvoting/downvoting based only on value is one that has appeal to many of the sort of people who hang around here. We are all still human, but I would not be surprised to be told that many or most Less Wrongers are atypical in this way. (Pay less attention to social contexts, and more to content.)
Let's not pat ourselves on the back too much. Voters here absolutely respond to social cues (albeit unusual ones from the perspective of the wider culture) and to local status; the vote record on a post is not a totally dispassionate estimate of its quality.
That said, pure social awkwardness might limit a post's potential upvotes, but it usually isn't enough to get a post downvoted: that takes obvious bias, factual error, egregiously bad English, a perception of bad faith, or -- exceptionally -- attracting the ire of a serial downvoter. The truly clueless may risk pattern-matching to "bad faith", but that's fairly rare; the rest are more or less orthogonal to social skills.
This is the public group instrumental rationality diary for January 16-31.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating.
Immediate past diary: January 1-15
Rationality diaries archive