When people get retaliated against for opposing genocide, support them.
Educate yourself by listening to Palestinians. Listen to Anti-Zionist Jewish people who have either been able to resist or overcome indoctrination. Listen to how leftists of other oppressed groups relate to Palestinians.
Take what you learn, and inform others. Don't waste time arguing with people who have made a firm decision against opposing genocide. Focus on the young people and those willing to learn.