The depiction of disabled people either being innocent untouchable angels or evil villains is dehumanizing and objectifying.
One example is that I was speaking to a guy who said something offensive and when I pointed that out he got very angry, telling me that I had to be nice because people in wheelchairs were always nice. When I asked him where he got that assumption from he admitted that it was from TV and movies.
He was acting out a trope in which I either had to be nice and be one of those good people in wheelchairs or I was not allowed to exist because one of those bad people in wheelchairs always gets murdered by the hero.