Some Jews attacked Christians from the very beginning, including mob executions and bannings from synagogues to lying to Roman police about them committing arsons in Rome. after the bar Kokbha revolt, the main surviving Pharisees retreated to a coastal town called Jabneh, iirc, and therein started the rabbinical 'traditions', rewriting a lot of 'laws', fake histories, etc. and started over, while most other Jews gradually assimilated into Christianity or into their own communities. The 'Orthodox' Jews aren't any more 'real Jews' than Christians are. Like Disraeli, a Christian Jew, said: " Christianity is Judaism completed." This doesn't sit well at all with the racist Orthodox and the ultra-racist Ultra-Orthodox, as it doesn't make them the center of the universe, a racist ideology they developed after the Babylonian exile, under the patronage of Darius's money and armies. They alienated the majority of Jews then and kept on doing so for the next 400-500 years and afterwards as well; the Jewish 'middle ages' lasted into the 18th Century, long after the Christian 'Renaissance', 'Reformation', and modernization's.
Much of the hatred comes from the fact they always aligned themselves with the state, and lived pretty well most of the time throughout history, with the occasional repressions, mostly due to politics, but far less than most other groups who fell out of favor and certainly far better off than the peasants they never minded squeezing for their own and the states' benefits. They did really well during the Thirty Years War, for instance, mostly looting peasants in the East for food and goods to sell to the armies in the western Europe. Naturally when the peasant revolts came along they were intent of killing Jews to the last man women and child. You can pretend this was 'anti-semitism', but they would have done the same to any group who plundered them like that, so I don't buy it was all just mindless Xian 'anti-semitism'. That's a rubbish argument. Jewish soldiers marched with the Muslim armies in their invasions and expansions into Spain, and served as garrison police and administrators for hundreds of years, so why would the local peasants not try and get revenge on them in their uprisings, or trust them after the Reconquestas?
And again, this was not 'The Jews', just the minority of Orthodox and ultra-Orthodox; they were not the only Jews, but they would have you think so and also whine about 'antisemitism' to keep anybody from airing their own dirty laundry. Many Jewsih Christians went on to do great things in the West, like Columbus, Montaigne in France, and a fairly long list of others.
