I think that the persistent argument is that they killed Christ.
That is a commonly cited excuse for Anti-Semitism, but I think it's an effect rather than a cause. There's a culture of Anti-Semitism and people who buy into it latch into any excuse they can find.
So here's billionaire math:
Murdering people and their entire families after brutally working them to death = Asking they pay a slightly higher percentage of their wages in taxes
Trying to globally monopolize natural resources to benefit yourself by selling people in developing countries things they need to live at a large markup they used to be able to get for free = Doing nothing wrong