Reassingning meaning

The writer states that a person who qualifies as disabled is done so mostly by a "social distinction." The writer also asks the questions "We're all disabled in some way, aren't we?" Most of the time a "disabled" person is identified through their physical characteristics. However, many of us have learning or mental disabilities (ADHD, Dyslexia) that are not easily "pointed out" by others. Does that make us less disabled than those whose are easily noticeable? Is it that those with "not-so-noticeable" disabilities pretend to fit in more on than the others?