"But I am Jewish and am gonna see certain things differently than you."
Solely because he is Jewish and I am not. We can look at the same thing, a car; he will see a Mercedes with Nazi flags flying from the front bumpers, I will see a Chevy hatchback.
"We cannot agree on anything on this topic."
I have to bold that: "We cannot agree on anything on this topic." Anything that I say, water off a duck's back. His mind is closed. We will never agree; we "cannot" agree; "on ANYTHING"; "on this topic".
"It's not something we are able to discuss."
Can't even "discuss."
So why did we? When the discussion is doomed to result in disagreement, when he knows from the outset that it is moot, because "I am Jewish" (and I am not), why begin? Why waste my time? And yours? Why not just tell me at the outset, "Harris, let's not both waste our time, I'm Jewish, you're not, end of discussion"?
Turn it around:
Him: "I like olives." Me: "That's because you're Jewish."
Him: "I don't like Mercedes." Me: "That's because you're Jewish."
Him: "I think Man City's guilty." Me: "That's because you're Jewish."
Him: "I'm a Democrat." Me: "That's because you're Jewish."
If I responded "That's because you're Jewish" to every topic of discussion that however tenuously and unintentionally touches on Israel or Jewish identity, he--and any Jew--would be insulted. I would be guilty of making an antisemitic presumption. "What, you just assume 'because I'm Jewish', that I 'am gonna see certain things differently than you'?! Harris, I thought I knew you better than that, you antisemite."
That's a problem.