It might help to use examples of some of what Zionists have done to Jewish people in order to demonstrate that it's not Jewish people that are the issue - it's a white settler state that happens to be majority European-Jewish trying to justify its colony while serving the interests of the US and Europe in the region. Anarcho-Bolshevik recently posted something about the Iron Dome misfire that has links to a number of shit Israel's done that's been harmful to Jewish people.
And if they somehow take that as a justification to hate Jewish people because a handful are exploiting their own people, then they're probably dumb (can't see that's what happens all across the world, throughout history, and isn't a racial or culturally exclusive thing), or just looking for something to justify their hate. In either case, it's probably a wasted effort to convince them, but by pointing out their flawed logic, you might convince others who are listening to the convo.