Perhaps the grandparent edit solves a few misunderstandings. Also, I would have understood your point better if you had said "graphic depictions of violence" instead of "violence", for instance. If they had been phrased like forum rules. I thought you meant all instances thereof.
I would strongly disagree with that statement; both in your depiction of LessWrong and your depiction of autistics.
Me, I haven't depicted a thing. For one, LW doesn't actually follow those norms in their strict form (no object-level or meta-level discussions of those topics). My claim was about a hypothetical community that does. For another, I meant people who either need to be sheltered from the nastier aspects of the world, or are psychologically incapable of deviating from rigid, literal, uncreative, mechanistic thinking. Substitute Spock, automatons, whatever.
As for humor, many LW users seem to have a poorly calibrated sarcasm detector.
It's not the sort of thing that gets better with lack of exposure.
I haven't depicted a thing.
You referred to "significantly less rationality than the average person, perhaps somewhere between children and autists". In what possible world is that not depicting autistic people as having "significantly less rationality than the average person"?
(Treating "autists" as interchangeable with "Spock, automatons, whatever" is also pretty obnoxious, though it's not exactly a matter of depicting anyone in any particular way.)
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.