As a Jew who passed physics, I can tell you that it is not antisemitic. Nor is it to say “fuck PeePee Netanyahu’s campaign of destruction and misinformation.” Saying all Israelis are bad isn’t antisemitic, but it’s not correct. Saying that you dislike Israel because it has too many Jews is both antisemitic and valid, oddly enough. Saying you hate all Jews is antisemitic.
Anyway, most of the people telling you that not supporting Israel is antisemitic are, in fact, actual antisemites. They’re the same people who say that it’s actually racist to call someone a racist.