Those enemies have long used European allies that descend from a long line of antisemitism, from both left and right wings. They often use "Israel" as a cover for their anti-Jewish beliefs. Several United Nations agencies seem to exist for the sole purpose of condemning Israel, while ignoring much worse issues elsewhere -- and that's not because Israel is uniquely bad.
Israel's right wing government has taken advantage of this. So much anti-Israel sentiment is antisemitic that they can lump in all of the many, many valid criticisms. They believe, with some justification, that they will never receive fair treatment so they might as well do what they are accused of.
I don't wish to "both sides" this. I'm just explaining that Jews have experienced so much bad faith argument that even Jews who are disgusted by the Israeli government expect outside criticism to come from a similar malfeasance. Maybe you specifically want to have a good faith discussion, but statistically the odds aren't great. So the arguments get shut down by the most expedient means, not the most correct ones.