According to the government agency, the EEOC, all forms of autism are among the list of disorders in US code, that are consistently defined as disability under the Americans with Disabilities Act, ADA. In US code, Autism is defined as a disorder that consistently limits the functioning of a major body system, specifically a limit in brain functioning.
While the identified behavioral impairments can also be associated with the ADA definition of disability, a limit in brain functioning is the core limit of functioning addressed as meeting the definition of disability, per Autism, in US code.
I agree with aspects of the social model of disability as well as the medical model of disability. Human beings have evolved over thousands of years, not only to be increasingly dependent on each other, but on the infrastructure of society through cultural evolution in the span of one lifetime as well. This element can accommodate disabilities, as well as create them, in extremely complex ways that are not fully understood, and may never be fully understood.
But overall, the infrastructure of society is much more accommodating to individuals with disabilities than before those accommodations were made possible by the modern infrastructure of society.
And, without that cultural infrastructure, many individuals would find themselves, in practice, with disabilities that they never realized they possessed, as social animals that are accommodated everyday through the exoskeleton of culture, well beyond what is designed as accommodations for individuals with disabilities, or what is commonly identified as disability.
Take away electricity from the entire country for a month, and one would have a population consisting of millions of individuals that would be suddenly functionally disabled, as many individuals in the US, are almost completely reliant on that one factor associated with the exoskeleton of culture.
Primitive cultures that still exist in South Africa and South America, are not potentially effectively disabled in this manner. But on the other hand it's not a good place to live, if one needs long term care in a nursing facility.
And the issue becomes much more complex as cultural evolution has led to new potential phenomenon associated with disabilities, such evidence that about 25% of teens are on the verge of developing type two diabetes now, and projected at one third of that demographic in the future, as compared to about 9% a little over a decade ago.
http://well.blogs.nytimes.com/2012/05/21/diabetes-on-the-rise-among-teenagers/
Independence is a relative term, depending on one's circumstances. The type two diabetes phenomenon is just the tip of the iceberg.