Earlier quoted context omitted.
Autism is seen as a large and wide spectrum of many different symptoms all called "autism". Using terms like "high functioning autism" is probably not a helpful way to talk about some color on the spectrum, however. Source: I am the parent of a child with autism.
Can you clarify? How should one talk about and differentiate between the frequencies?
Reducing the conversation to high/low functioning also limits people's understanding and compassion of autistic people. The sibling commenter to you said they believe high functioning autistic people don't deserve to have a say over matters concerning autistic people, which is incredibly troubling because that just becomes and avenue for silencing autistic people; if having the ability to speak up for yourself means your opinion isn't valid, then that gives license to use and abuse a population, as autistic people often are.