Sorry, don't agree.

I think the little preface, "if you're GENETICALLY inclined to negotiate the last penny" followed by the yiddish remark.. denotes that this sales person, owner, manager, etc. is not Jewish.

If he said, "I like a good deal, so if you're like "me" this car might not be for you."
Then I might agree.

This guy is saying, Don't Jew me. And phrases like that don't come from Jews. We say, don't rip me off.

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"When two people agree on everything, one of them is not necessary" - Arliss