If anyone really knew anything about history, the persecution of the Jews started with the Pharisies and Jews descriminating and punishing the "Jew Christians" as they were called and were later totally Excommunicated from all of Jewish life, as they at that time still worshipped in temples and the like.
St Stephen in 43AD being murdered at the hands of the Jews, Paul the Apostle was arrested in Jereselum by the Jews, turned over to the Romans who later executed him in Rome, and then the final break came when the Romans burnt and destroyed the Temple in 70AD, the Phrasies excommunicated all "Jew Christians" from being and living out the life of a Jew, and all "heretics" and a curse was prayed at the begining of every synagogue service on these "Jew Christians" from that point on.
That was when the "Jew Christians" realized they needed to start their own church, as up to that period that was never the real intention.
So , not to ever condone violence or hatred, this anti-semitic behavior is due to the actions of the Jews of the 1 through 3rd centuries who took pride in pointing out to the Romans where these "Christians" were so they could be turned over and killed.
Not to stray too far but did either of you watch the live interview last night on EWTN Live, hosted by Fr. Mitch Pacwa with a forensic pathologist and authority on crucifixions?