Criticize the settlements, fine. Criticize the policies of the Israeli government, fine. I do both all the time (and I'm Israeli--and Jewish). The line is crossed when you start to accuse "the Jews" of bringing the Holocaust on themselves, bringing up the "Protocols of the Elders of Zion" as truth, when they've been proven to be a forgery in four different courts of law in four different countries (none of them Israel) and claiming that "the Jews" own the media. These are exactly the same arguments Adolf Hitler used, and are a yardstick for "classic anti-Semitism".
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