comment: >
  
  Society defines what a mental disability is, therefore if you meet that definition then you are considered mentally disabled. However, the extent that societies definition CAUSES your disability is limited to that of a label, there is no physical manifestation of that.
  Psychologists look at the broad range of human behavior and defines what is typical, if you fall outside that typical range then they have conjured up some labels to help categorize.
  So, human behaviors never changed, it's just that we have built complex ways of sorting them.
  I suspect the same is true of physical disability.
context: The problem with this analysis is that it doesn't engage with a theory of causality. Just because society is involved in the definition of "disability" or in the categorization of things as disabilities, doesn't mean that those disabilities are caused by society.
  By analogy, which things are called "blue" is determined by society. That doesn't mean that the sky being blue is caused by society.