No, it's definitly a joke - it's an ironic, sarcastic look at the subtle racism that goes on, coming from the misconceptions of people of all races towards each other, due to people still being intrenched in old stereotypes.
(I know it's not for real partly because they talked about the makers of the site on radio4, and also the pictures are so set-up and cheesy, as is most of the writing.) I guess some people may feel that making fun of such a subject is wrong, however, I think that it may often be the first step to combatting such problems - providing the people it's aimed at get it.