Yes disabled people shouldn't have any special rights but they should have the same rights as everyone else, the right to live as functional life as possible, if that requires that the rest of society make some accommodations then that's fine by me.
Any society is the sum of its parts, all its parts and should be judged on how it treats everyone able bodied and not.
This proves too much. If someone living a functional life requires, say $1 billion, then your argument says they have a right to it, while I expect the vast majority would disagree.
I think the problem here is really the negative externality of waste. The proper response is to charge a https://en.wikipedia.org/wiki/Pigovian_tax, so the actual societal cost is passed on to the consumer. Then no one can complain that someone's wasting, because their cost perfectly cancels out the effect.
Separately, we can subsidise the cost for people who can't afford it, but that's a different discussion from allowing wasteful products (that people are willing to pay for) to exist in the first place.