Not all disablilities are apparent. If a person makes a request or acts in a way that seems strange to you, it may be disabliltiy related. So don't make assumptions. How you can help in eliminating barriers confronting people with disabilities. They can project images that are inaccurate and damaging to a person.
Many people use words that focus on characteristics rather than on the person as a whole.
When speaking or writing about a person with a disability keep the following in mind. Wheelchair user or person who uses a wheelchair. Say person with a disability. Many disabilities have nothing to do with disease. It's better to say condition.