I'm not from US, but, I think the most obvious answer would be something along the lines of "because the Jews are overrepresented in business and government, and the Blacks [and also hispanics] are 'overrepresented' in violent crime." In Europe it would be Arabs and Turks (the violent crime part), in Russia people with Caucasian (from modern Caucasus, meaning Chechnya, Dagestan, Georgia, they're like a separate race of people they have more in common with each other than with any ethnicities from Russia, East Europe, Balkans or actual Europe) blood in them, and their kind live all over Russia, would be responsible for most of the violent crime (and for the disrespect, bullying, hate, loud and rowdy behaviour). In Russia there's a taboo of sorts on hating Jews, hating the westerners (and especially Western govenments) is ok, hating the government (although hate for Russian governments and hate for West are usually mutually exclusive, one who hates one of them usually doesn't hate the other, and dislikes Russians from the opposite camp, especially if he is a pro-Western) is ok, hating the Jews would most of the time result in verbal abuse, bullying, mocking, and being called a conspiracy theorist. That is not to say that the Jews didn't cause massive problems in both Russia and other post-Soviet countries. Hating on Caucasians (explained above) is very socially acceptable (no one denies that they're subhuman scum) but illegal (we have laws against hate speech.)
So I can't tell you about America... In Russia it's still similar, it's either hate for the westerners (who are more powerful than Russians) or hate for the government (who also more rich, and more powerful, than average Russians), so either of these powerful groups replaces hatred for the Jews, in the majority of general population. Hatred for violent criminals is aimed at Caucasians and Gypsies and other such people.
I think an average black person would not be hated in for ex. Ukraine or Russia, because he is not white and therefore not percieved as powerful. Whether he or she would be percieved as a violent thug or not, I don't know. Depends on that person, I guess. To deserve this kind of hate he would have to out-do chechens and Dagestanis first.
Hope this was interesting or helpful, I have nothing more to say...
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