This might be very idiosyncratic to how you engage with people or with whom. I've lived in the deep Midwest and in an east coast major city. My name is EXTREMELY jewish. I have literally never had to explain my position on Israel or zionism when introducing myself. If Israel comes up in conversation in one way or another? Sure, people have asked what my opinion is, as a Jewish person, on Israel or such and such events, but that's pretty reasonable and I don't think ever frontloaded with anything.

Yea, that's on the asswipe saying that. We get to meet them everywhere.

What can I tell you, other than to avoid the kind of people who take something about you, and turn it into an attack. Also don't bring up the topic yourself unless you want to defend it, and —however hard it is— try to "not attribute to malice, that which is simple ignorance".

There are also some rhetoric tricks you can use to return an attack, but you risk being perceived as a troublemaker.