The accusation that some of Israel's actions bear comparison with Nazi atrocities is of course a hurtful one, but I'd question whether it can be termed anti-semitic, since it only makes sense because the person making the accusation is appealing to a shared loathing of what the Nazis did to Jews (and gypsies etc).

A more relevant comparison, where the parallels are less distant, is sometimes made to apartheid South Africa - where some of the most active opponents of the system were members of the Jewish community, though at the same time the Israeli government at times had a somewhat different relationship to the regime.