One of the major groups supporting the Palestinian people and their right to self-determination is 'Jewish lefties'. Alongside Palestinian voices, those who feel solidarity because of Arab or Muslim identities, and those who work in general against colonialism, Jewish lefties who make a specific point of rejecting the 'community mainstream' of generally supporting Israel are and have always been involved in opposing the excesses of Zionism.

I know some of them and they are very brave people. They are constantly accused of being 'self-hating' and even Nazi sympathizers by more right-wing Jews. It's a pretty big deal if you are Jewish and get accused of being a 'Kapo' by other Jews. And they are often treated with suspicion or worse by other pro-Palestinian activists. Many people expect them to constantly condemn, apologize for or disassociate themselves from Israel's actions, simply because they are Jewish. They also have to contend with the fact that a proportion of their 'allies' are either actual antisemites using Palestine as a pretext, or well-meaning idiots who get caught up in conspiracy theories and racist tropes without understanding how they are connected to antisemitism.

I would say that being leftwing and opposed to the status quo in Israel is one of the major reasons that Jewish people become disillusioned with their community and end up completely rejecting the religious identity. And having to deal with accusations like yours is one of the main things stopping Jewish people who oppose the Israeli occupation from being more involved in activism.