All of the above responses make valid points. I would like to add that simple envy/jealousy also comes into the equation: Due to a long history of hardship Jews have acquired a culture (call it a habit if you will) of hard graft in every sphere, loyalty to their own, a very wry and sometimes biting sense of humour, plus they seem to include an unusually large number of people who are artistic (look at the Western entertainment industry). Those who are short on these attributes resent this. As for the fanatical element, they are their millstone as with every group of people who are characterised by their religion (Christians, Muslims, etc.).