Discrimination

Offensive content that relates to matters such as race, gender, religious, disability or sexuality can appear in media content, and hence when rating the material, the BBFC need to consider to impact/strength that this content will have on the viewing audience.
The context in which it appears in also has some influence on the given classification.
The BBFC might be less restrictive with their classification if the work is obviously out-dated, or the discriminatory language + behaviour is implicitly or explicitly criticized, or the material's purpose is to challenge peoples perception.