I just watched a really good documentary called Monica and David about two people with Downs who marry. Part of the issue I had with the film was exactly what you guys are talking about. While their mothers let them marry, they won't let them join to work force because they were afraid of Monica and David facing prejudice, and their thrust to protect them kept them MORE like children and made having a baby out of the question...
For me, it was just a matter of men being tied to the normative body -- my movement is different. I do think the younger generation tho is being exposed to people of all genders and this understanding of trans and so on makes understanding of disability easier.