The Self-Hating Jew is as old as Judaism itself. It even occured in the Torah, the Jew who was striking a fellow Jew, who revealed to the Egyptians that Moshe had killed the taskmaster. This was the ancient Kapo, who worked for the Egyptians, and subjugated his fellow Jew in order to gain favor with the Egyptian society.
We will always have these people, and we also worry about the Erev Rav, the Egyptians who came out with us because they thought it was a good thing to do, not because they wanted to be the Priestly people, nor the Holy nation which G-d expected us to be. They want to just be counted among the nations of the world, and they will sell the Jewish people down the drain in order to do so.