If you wanted to keep it mild and diplomatic, and avoid further antagonizing such a person unnecessarily, you might simply refer to that person as a ...
"Prejudicial racist anti-semitic bigot" .
Answer:
Antisemitism/antisemite
Step-by-step explanation:
Antisemitism is hostility in general towards anyone who worships and follows the religion of judaism.
Someone who believes in antisemitism is called an "antisemite"
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