Harry Potter meta: Muggles and disability

The thought hasn't had time to coalesce yet, but this unfunnybusiness post about Snape fans denying the "blood purity=racism" metaphor got me thinking about how in some ways being a muggle is like a disability, and so muggle-borns are the able-bodied children of disabled parents. Like...hearing children of Deaf parents who grew up in Deaf culture (of course some Deaf people would argue that it's not a disability, just a different way of being, but I'd say that's just as true of being a muggle, whatever the wizards think on the subject) Plus of course there's the squibs.

On the whole I think anti-muggle prejudice functions more like racism, but it's interesting to ponder.