Racism has been important in zombie stories since the very beginning, and we don't mean people discriminating against zombies simply because they are zombies (a zombieist?). We can't really hold that form of prejudice against anyone. We mean that early zombie films like The Night of the Living Dead used racism as an important theme. Like, the idea of not working with someone because of his skin color just seems extra stupid when death is literally at the doorstep. World War Z follows this tradition but also builds upon it. Racism is present in the early chapters, and then the theme spreads out as the novel goes, brining in other forms of discrimination such as classism, nationalism, and, uh, genderism?