Probably because they were anti-semitic Nazi flags. Anti-semitism does not mean what you're saying. However, it is often that people hide behind criticizing other things to target them and act innocent. There's a difference between saying "the elites" and "the globalists" for example. We know what people mean by both, and they aren't saying the latter by accident.
I do agree that Israel uses "anti-semitism" as a cudgel against anyone who dares criticize zionism. That's a whole other issue though.