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.