The wonderful comic, Sam Levenson, had a great answer to anti-Semites.
"It's a free world and you don't have to like Jews, but if you DON'T, I suggest that you boycott certain Jewish products, like .....
The Wasserman Test for syphilis, Digitalis, discovered by Doctor Nuslin,
Insulin, discovered by Doctor Minofsky,
Chloral Hydrate, discovered by Doctor Lifreich,
The Schick Test for Diphtheria,
Vitamins, discovered by Doctor Funk,