Not arguing here. But just want to point out that disability subculture usually arises as a survival response in the face of discrimination and segregation. Everyone has a need for community and a sense of belonging. When broad hegemonic culture rejects you and your presence, belonging is found in the one distinctive feature that it the cause for the rejection. See also gay subculture as a response to homophobia, US black culture as a response to racism, feminist sorority subculture in response to misogyny, etc. So it is not rare to see disability subculture as a response to ableism.