Part of Vat. II: Never offend or try to convert a Jew, no matter what
It's virtually impossible to humiliate a coward who shows he's ashamed of his faith. There's a lot to be said for the Copts who tattoo their wrists with the Jerusalem Cross, even though they live in a Muslim-controlled country.
But whoever shall deny me before men, him will I also deny before my Father which is in heaven.