1/3 of blacks antsemitic? Obviously it must be among those black who know about Jews. (Many black tribes in Africa may have never heard about any other nation than theirs). And I'd say that 40% of whites are also antisemitic, either openly or under their disguise of antisionists.
It's not a question of race but ideology, Arabs are worse than anyother people, not just because they are Arabs, but because they are mostly Muslim or leftist commies panArabic fascists (the second case is very rare now, but it was quite commmon in times of Nasser and Kaddaffi). I'd say that more than 80% of all Arabs hate Jews at best, or support terror at worst.