How are stereotypes used as a shorthand to represent certain groups of people?

The media is responsible for everyones opinions and representations of people, whether they be positive or negative. This happens either with pictures or photographs, films or television depictions. In these short amount of time, the audience may not see the the "group" or "person" for what they really are.

The film "Murderball" is a good example of this. However within the first 10 minutes the audience is presented with this stereotypical contradiction. The quadraplegic "stars" of the film are firstly shown as althletic, wheelchair bound phsycopaths playing wheelchair rugby. This contradicts how the media represents disabled members of society.