Thesis Barnes is right: being disabled is not in itself bad for you
Where it stands
I came to philosophy through effective altruism, where it's common to count disability as a reduction in wellbeing and to rank interventions accordingly. Elizabeth Barnes's The Minority Body changed my mind, and I want to defend her thesis.
Thesis: disability is a ‘mere difference’, not a ‘bad difference’. It may be bad for someone in a given society, through stigma, exclusion and inaccessible design, but it is not intrinsically bad for the person who has it. Being disabled is more like being gay or being a woman in a hostile society than like having a disease that can only diminish you.
The argument I find strongest is about testimony. Many disabled people report levels of wellbeing much higher than non-disabled people predict for them. The usual dismissal is ‘adaptive preferences’: they've lowered their expectations. But we don't treat non-disabled people's reports of their lives that way. If you discount disabled people's testimony about their own lives while trusting everyone else's, you owe an argument for the asymmetry, and the obvious candidate argument assumes disability is bad, which is the point in question.
I'm aware of the hard cases. Chronic pain. Degenerative conditions. Barnes discusses them. I think she can say some impairments involve intrinsic burdens while the category of disability is not a bad-difference category. But I'd like the objections, especially from people who know more than an undergraduate.