Germany’s laws do often conflate the two (here’s an example), so that’s more tricky than it might seem.
So in light of that it may be wise to have the German instance not actually be in Germany.
Though as I said, that may not be feasible and hypothetically isn’t the only option. I don’t think either option is likely to be taken by the OP, I don’t even think bare minimum attempt not to support Zionism will be taken by them. Their behavior doesn’t show it. I feel like they would probably agree with what happened in the article I listed.
Careful, that question is usually not asked in good faith.
On its own advocating against genocide doesn’t make one a Zionist. That question you phrased is usually made in bad faith to imply that Anti-Zionists fighting against occupation of Palestine are advocating the killing of the Jewish people already there. If one asks the question or states this with the intent of implying that Anti-Zionists are advocating violence towards jewish people, it is likely they are a Zionist, not for believing that people shouldn’t be killed but by making an implication in bad faith. An implication which is by nature a Zionist strawman.