Anti-Semitism is more than just prejudice. It is prejudice as political doctrine. Social distaste and ostracism of Jews does not rise to the level of anti-Semitism until it becomes a political force, an ideology that shapes the political self-understanding of its adherents.
Anti-Semitism became the litmus test for the conflict between some class interest and the interests of the state, which situated itself above any class. Jews had defined themselves as identified with no class and exclusively with the values of the state. Class consciousness was therefore never evolved within the Jewish people. The Jewish subject class was too servile. Torah sh'baal peh had become the extraction distraction for the Jewish people.
The difference between the rabbinic regime and the biblical regime was the role God played in the relations between classes and state. In the biblical regime YHWH is the ruler Who speaks for the lower classes who had known servitude; in the rabbinic regime God speaks for the upper classes that are ostensibly refining His ethical dictates. With the advance of the modern era those ethical dictates become preceded by political dictates while the Jewish ruling class identifies God's teachings with their own struggle to maintain power, the full expression of which is the doctrine of Daat Torah.