So maybe don't? Next time you see an antisemite saying that, rather than parroting their talking points to others, you can tell them the same thing: zionists and jews aren't the same thing, and many jews are members of the global consensus in opposing the ongoing israeli genocide of Palestinians. Or don't, maybe it won't make a difference, and it's your choice.
In the meantime, please stop repeating hurtful antisemetic tropes by conflating us jews with zionists. We are not the same. Criticism of zionism and the israeli genocide of Palestinians is totally legitimate. Propagating antisemetic language is antisemetic. That means smarmy posts I've seen around saying things to the effect of, 'zionists... you mean jews??? [*wink wink*]'