Because he is a MK idiot who tries to discredit people in the rest of the world who he is told to make fun of, for political reasons given to him and his producers by government officials, with his films like Borat.
I have personally met someone from Kazakhstan, a legal immigrant, who said she was greatly offended by the film as it portrayed the country as a dirty, illiterate, poor country, while living standards there are nothing like that in the film.