Anti-Semitic Jews
Yes, there are anti-Semitic Jews, just as there are self-hating Blacks.
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The worst aspect of racism, or of any hatred, is that the victims introject the negative emotions into themselves: I am unlovable. I am ugly. I am stupid. I have kinky hair. I am inferior. I don’t deserve my own nation. I deserve to be oppressed and vilified.
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That such people exist is tragic. But it proves only that they are also victims, not that what they say is accurate. Self-hatred is still hatred.