I am not really part of a jewish american culture, that much. I would say that there are a few things
1. a lot of jews who are on the upper end of the baby boom, or a little older, like my parents, worked for civil rights. some of them, like my father, worked hard for civil rights, physically fought for it, and then came away with a very bad feeling about the attitude they felt from some blacks concerning jews.
2. a lot of older jews, of the born before 1940 generation, or even older, and espectially first generation immigrants, give a great deal of value to things like education, hard work, discipline. if they perceive that a group doesn't hold the same values, they can be very critical. I think this is not much differnet from the problems that confucian immigrant groups have with african americans today often.