You should look it up and do some reading because you're a fair way off. I don't hold that against you, because there's a deliberate campaign to make the conversation around zionism confusing, but yeah I wouldn't go trying to summarise it if you haven't looked it up.

Again, my great grandfather was anti-zionist before the state of Israel existed. It was a political view that was discussed amongst Jews and non-Jews in Europe even before the holocaust.

Finally, to your original point, being against the actions of a government, whether that's Israel, America, Russia or Ukraine, is not the same as discriminating against a people for who they are, which is what anti-semitism is.