Well, if it leaves one unable to function effectively in society, or seriously hampered in that, it does make sense to differentiate from a less strong case.
If a person can't e.g. talk to someone to buy food, and the huge majority of people can, then they have a problem. That's not severe - it might be not perfectly accomondating, but it's reasonable. And of cource society does try to help in many ways (consulting, people being understanding, parents, school experts, medicine, etc)