“People are fine with LSN autistics but once an HSN autistic shows up—” Let me stop you right there. Just because ableists treat HSN far worse than LSN does not mean that they actually love LSN people. LSN folks are “accepted”, yes—but that acceptance is conditional. The so-called Acceptable Autist is a narrowly-defined caricature.
To be an Acceptable Autist (TM) you must show a particular amount of symptoms. Too few symptoms and you are fakeclaimed, too many symptoms and you are “using your autism as an excuse.” Instead, your symptoms must be obviously autistic enough to “count” but not so autistic that they become “annoying” or “cringe” or “scary.” Being an Acceptable Autist means walking the narrow tightrope between “neurospicy self-diagnosed faker” and “gross weirdo freak.”
Acceptable Autists also must work effortlessly to mitigate their disability symptoms. They are required to mask constantly or else they are “using the autism as an excuse.” But they also should not mask completely, or they will be fakeclaimed (see above). Having bad social skills, in the eyes of ableists, is not “excused” by autism because it is the responsibility of the Acceptable Autist to fix themself to fit in.
Fictional characters may not be headcanoned as autistic if they seem too autistic because that is stereotyping. Fictional characters may not be headcanoned as autistic if they don’t fit the stereotype, either, though, because then the headcanon is “a reach” and “projection.” If a fictional character shows signs of a different disability, like PTSD, autism is also out of the question because, as we all know, disabilities are mutually exclusive. In fact, it is best not to headcanon characters as autistic at all because that is romanticizing autism. The Acceptable Autist sticks to canon autistic characters like the Rain Man.
The Acceptable Autist can pick and choose their special interests. A problematic special interest must be dropped entirely and replaced with a suitably “unproblematic” topic instead. Furthermore, the Acceptable Autist never allows their Unproblematic Special Interests to “take over their personality”, especially if that interest is regarded as childish.
Acceptable Autists are never allowed to say anything nice about their disability. Autists who do say nice things are accused of being fakers, regardless of their support needs level. On the flip side, an autistic person who complains about their disability is being whiny and making excuses. The Acceptable Autist must navigate this moral quandry.