Certainly when I last looked, the CG threads did not have anything I would have described as prejudiced or unpleasant against people with disabilities.
Forgive me, but I sometimes think there is an eagerness not to understand, and I think this can apply equally to both sides of the debate.
Of course, parents of children with disabilities form strong bonds with them, and these bonds I imagine will be in some ways even stronger than parents of NT children (the bond, not love itself) because of the nature of caring for them, interceding on their behalf and so on, lasts beyond childhood in many cases.
The debate around Charlie isn't just about disability, however, it's about pain. They are different things. Many people without disabilities experience pain; many people with disabilities do not (or at least, not notably more than any other person.)
It is therefore not disabilatist to express concerns that prolonging Charlie's life prolongs his pain. Nor is it disabilatist to contemplate what his quality of life might be if he were 'allowed' to live.