Racial Stereotyping - "Colour Coding"

It's automatic.

Or so says Jones & Fazio (2010) in "Person Categorization and Automatic Stereotyping Effects on Weapon Identification". It was published in the Personality and Psychology Bulletin, 36(8), pg 1073-1085. The corresponding author is attached to the psychology department of the Ohio State University.

Stereotypes are cognitive representations of categories of people and their associated attributes. In the absence of individuating information, they allow us to 'predict' others' actions (ibid). I'm not sure if stereotyping really corresponds to action prediction, but I do know that under certain situations, even the most liberal and cosmopolitan people will make that mistake.