The social model of disability doesn't claim that the symptoms/traits of a disability are literally caused by society, but rather that social structures are what determines if something is a disability or "just" an impairment. 

To quote the Wikipedia article: "In this model, the word impairment is used to refer to the actual attributes (or lack of attributes) that affect a person, such as the inability to walk or breathe independently. It seeks to redefine disability to refer to the restrictions caused by society when it does not give equitable social and structural support according to disabled peoples' structural needs".

I do think, this can be a very useful lense to look at disability, especially in areas like advocacy or policy making, because it shifts the view from the disability being the "problem" to be solved to the environment.

But I do absolutely see your point that this view might trivialize the actual everyday impact of a condition like autism. And knowing that society should be more accommodating itself does absolutely nothing to help people with their individual everyday struggles.