When disabled people, Autistic and non-autistic, say that they use identity-first language to refer to themselves, a common retort is “I don’t understand why you would define yourself by your disability.” To me, this doesn’t make sense. I call myself disabled because I don’t think my disability needs to be held at arm’s length, not because I believe that I’m autism on legs.
(As with my other traits, I refer to my disability with an adjective-noun construction which is common to the English language. I would also describe myself as a long-haired woman. So far no one has come forward to demand that I instead refer to myself as “an individual with long hair,” or accused me of “defining myself by my hair length.”)
I’m starting to think that when people say “defining yourself by your disability” they really mean “talking about yourself in a way that reflects the belief that your disability is not detachable.”