Individuals with disabilities have varying degrees of need, and are sometimes sick, just as non-disabled are sometimes sick. Mistaking a disability for sickness not only fails to sometimes sick. People with disabilities have needs just like those who are non-disabled, and they strive for a high degree of quality of life as other individuals.
Society handicaps individuals by building inaccessible schools, theaters, homes, buses, etc.
A person with a disability a simply carrying out normal activities of living when they drive to work, go shopping, pay their bills, or compete in athletic events. Even those with the most severe disabilities could live in their own home given adequate community based service, and at the very least, they should be given that choice.