Unless you take a survey, you won't get a remotely representative sample, but as one of the more activist/SJW-like autistic LW readers, I found the comparison annoying, although not really offensive, because it didn't seem like Dahlen was trying to reference actual autists. To steal and modify Yudkowsky's favorite Davidson quote, if you assert that autistics have below-average rationality, are childish, and are Spock-like, then you do not make any assertions, true or false, referencing autistic people. Rather, you're just using a stereotype as a reference point for talking about some other category.
Noted. Thanks.
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.