> The suggestion of a group you identify as being less, causes a predictable reaction to characterize the other (non-aphantasia) as problematic/hallucinating (i.e. broken/lacking).

No, it's not a defensive/counterattacking reflex. The thought of people hallucinating all the time is terrifying to me, because hallucination is a sign of something being very wrong, like schizophrenia. After getting past the language barrier and finding out these were "mental hallucinations" rather than "visual hallucinations", it's slightly less scary, but still unsettling for me to think about. Finding out that visualization was actually a thing meant that idioms that I thought were metaphors or superstition were suddenly something the majority of the population takes literally. People who have "invisible friends" talking to them all day long scares me though.