Paul Beatty was on Tuesday named as the first American to win the prestigious Man Booker fiction prize, for “The Sellout,” a biting satire on race relations in the United States. The narrator of “The Sellout,” an African-American called “Bonbon” tries to put his Californian town back on the map, from which it has been officially removed, by re-introducing slavery and segregation in its high school. The 289-page novel begins with “Bonbon” facing a hearing in the Supreme Court, looking back over the events that led up to that point. The language is uncompromising and may offend some readers.