The world has a habit of placing those who are different from us into different categories. For example, those of lower socioeconomic classes are given sympathy by the upper classes. While they seem to give sympathy and treat them nicely, they are at the same time inwardly condescending. While they convince themselves they are not, they simply do not view those below them as equals.
This also applies to handicapped individuals. However, one thing many people do not understand is that these people are just like everyone else, other than their physical condition. They also have the same wants and desires as everyone else. If you underestimate them and mess with them, you may endure the ultimate humiliation.