Bingo.
I'm not even sure what the Z-word is supposed to mean, especially when it's used as a club or an insult or conversation ender. But what I do know is, typically it's used by people who hate Jews and/or Israel, at least in my experience.
/got some Jewish a ways back in the family tree
We all have Jewish a ways back somewhere. I don't hate Israel or Jews either. And I have called them out numerous times on this board. I just wish they come to Christ!