Since no one spoke on it:
In essence, basically the main stereotypes one hears about Jews are in relation to money: whether it's smart management of money, being greedy or stingy, or the idea that Jews control all banks/world finance.
Considering how these stereotypes have been used historically to provoke violence or make violence justifiable based especially the last stereotype (Hitler and the Nazis used this one in particular as one of the justifications for the Holocaust), some Jewish folks can be sensitive on the subject.
That and just some folks don't like people talking sh*t about them, even if the person isn't but it seems like they are