It is argued by some academics that the concept of Jewish self-hatred is based on an essentialisation of Jewish identity. Accounts of Jewish self-hatred often suggest that criticizing other Jews, and integrating with Gentile society, reveals hatred of one's own Jewish origins. Yet both in the early twentieth century, where the concept developed, and today, there are groups of Jews who had "important differences in identity based on class, culture, religious outlook, and education", and hostility between these groups can only be considered self-hate "if one assumes that a superordinate Jewish identity should take precedence over other groupings of Jews."