This graphic is helpful.
My 14yo son can pass as “high functioning” or even neurotypical- but inly because we have curated and managed his life, environment, school, advocated for him, taught him to self advocate, manage his sensory and social needs daily, plan for every eventuality, etc etc so that his needs are met most of the time. He still needs a lot of down time as all of the “high functioning” and masking takes its toll, and that’s what people don’t see. All of the accommodations and thought and effort that makes it possible.
But if anyone saw him in meltdown, or suicidal Autistic burnout (at age 11), not at school for a year, depressed, a shell of a boy, they would absolutely not describe him as “high functioning”.
Some Autistic people’s challenges are external and visible, others are internal. No two Autistic people are alike. And their “functioning” can change day to day - just as neurotypical people’s can.
Just to add, Asperger’s has not been a diagnosis in the DSM-5 for a decade. Dr Asperger was/is controversial as that diagnosis was originally used for Autistic people who could still be “useful to society / the economy” instead of locked up in institutions or asylums. He was also a N*zi. Just giving some background on why a large part of the Autistic community balk at the label, which is their right. I personally don’t believe in telling anyone how to describe themselves, but some context to the wider conversations will help with understanding.