In my experience, the social issues are actually closer to perception deficits than reasoning problems. It's harder to "read" emotions and faces and to predict other people's behavior, but just because I have trouble perceiving these things doesn't make me any less rational. Picture someone nearsighted. They are aware of their perceptive deficit, which impair their ability to predict what they will encounter as they travel. Is that person less rational due to their perceptive deficit, which impairs their ability to form models of their environment? (Yes, I am trying to get more precise perceptive abilities, but only to the extent that this is actually a good use of my resources.)
If a paperclip maximizer had significant trouble counting paperclips, would you say it did not care about paperclips? Similarly, I care about other people's preferences, even if I am worse at detecting them than the average human.
For example, what would be inappropriately off topic to post to LessWrong discussion about?
I couldn't find an answer in the FAQ. (Perhaps it'd be worth adding one.) The closest I could find was this:
However "rationality" can be interpreted broadly enough that rational discussion of anything would count, and my experience reading LW is compatible with this interpretation being applied by posters. Indeed my experience seems to suggest that practically everything is on topic; political discussion of certain sorts is frowned upon, but not due to being off topic. People often post about things far removed from the topics of interest. And some of these topics are very broad: it seems that a lot of material about self-improvement is acceptable, for instance.