For hundreds of years, the large, gentile nations have been reacting to the Jewish communities within them as “hosts” would to “parasites.” In recent years, Kevin MacDonald (MacDonald, A people that shall dwell alone: Judaism as a group evolutionary strategy, Praeger, Westport, CT, 1994, MacDonald, Separation and its discontents: Toward an evolutionary theory of anti-semitism, Praeger, Westport, CT, 1998a, MacDonald, The culture of critique: An evolutionary analysis of Jewish involvement in twentieth-century intellectual and political movements, Praeger, Westport, CT, 1998b) put what appears to be a new twist on the host–parasite, gentile–Jew metaphor. In this version, Jews are portrayed as inherently superior beings, possessing traits that are actually considered admirable, e.g., diligence, high motivation for achievement, high levels of altruism to other members of the group, and a high level of investment in their children. However, this is merely a modernized, deceptive version of the host–parasite metaphor. The positive attributes MacDonald ascribes to Jews are used to bolster his claim to scientific objectivity, arguing that this theory cannot be racist antisemitism if it says positive things about Jews. In the end, MacDonald’s Jew is a superior competitor whose (unfair) success inevitably instigates an often violent, antisemitic reaction. Individualistic gentiles are out-competed by Jews who don’t play according to the same rules. In contrast to the individualistic gentile who plays fair, the Jews are more collectivistic, i.e., they are biologically more ingroup-identified, more strongly favor members of their own group, and are closed and hostile to non-Jews. The gentiles then react with violent hatred to prevent total domination by the superior, collectivistic Jew. Antisemitism—even in its ugliest, genocidal forms—is merely a natural, adaptive reaction of one group (white, European gentiles) to being unfairly beaten in the competition between groups over resources. Violent antisemitism is then seen as an ugly but extremely predictable and adaptive reaction to Jewish success based on unfair advantages. MacDonald’s misunderstanding and misrepresentation of evolutionary biology has been readily embraced by white nationalists and other antisemites. In this article MacDonald’s errors in logic and science are elucidated, revealing a pseudoscientific dressing on ancient antisemitism.