I don’t know about starting but Jews and blacks used to be right till they started acting white instead of...... Well you know
It all depends about the country, epoch and zeiteigeist at these times.
In some countries, Jews and Blacks were friendly. In others, they were not. And in few others, they became undistinguishable from each other yet still regarded non-Abrahamic aligned populations with spite. We can tall the same about pretty much any "black"-or-darker-skinned-to-white intersocial relationships in recorded History since as far as the Middle Bronze Age, perhaps even since the mid-to-late IIIrd millenium BC in the ancient Near East and Europe.
From an overall hindsight, it's complicated: they started being so religiously guided by the notion to hate "Hamitic" and mixed "Hamitic-Semitic" nations whose especially Canaan, Chaldea, Ismaelites, Midianites and most above all the Phillistines, Egypt and Kush that their priestly and later rabbinical scholars had practically fashioned some crucial noxious elements that will later numbers amid the earliest roots of anti-black Racism in both the Western and Eastern worlds.
The whole "
Curse of Ham" , "
Mark of Cain" and "
Downfall of the Nephilim" myths-- and the historical damage it caused, started out with their religious liturgy and folklore.
The colonial cliché of the tyrannical, manchildish and bloodlusted god-ruler ahead of a backwards and decadent tribe and his procession of witch-doctors started out with the intoxicating portrayal of pharaonic Egypt (an African "Hamitic" nation) his god-ruler and magician-priests as such in the Book of Exodus. And if today sexually promiscuous narcopaths amid black men are so often libelled as "
Jezebels" by both the black American Christians and white owned both media & arts that its original racially-neutral using has fallen into desuetude nowadays, it's because both black Christians and white American people preconsciously mirrored these dark-skinned, gaunty, overly makeup-embellished voluptuous vamps with a more ancient voluptuous and self-sufficient vamp of "Hamitic" stock from Biblical memory, the Phoenician-born Queen of Judah Jezebel infamous for her religious persecutions against Yahveh-worshipping Hebrews and hericide conspiracies against more legitimate scions of the House of David.
The cliché of the naked cannibalistic dark-skinned jungle/bush savage that permeates in various Eurasian cultures, although has already its (obviously Negrophobic, anti-Dravidian) antics in Hindu mythology (via the Mlecchas and later portrayals of the demonic Rakshas as jet-black skinned with thick curly hair and stereotypized Veddoid features opposite to the "fair" skinned Devas-- in spite historical records by both Indian chroniclers and medieval European travellers including Marco Polo that mentions it used to be the contrary in south India and assumedly originally such anywhere in earlier times) , its Western counterparts can be found through his Arabic and Jewish roots via the Arab slave trade but most above all the gnawing influence of the priaptically endowed, naked herbivore Kushite bush savage illustrated by 6th century Jewish prophet Jeremiah's words in his titular book.
And again, the first racially offensive statements libelling black men as closer to the ape than Men has started out, again, with Talmudic scholars in the 2nd century A.D. .
However, given that no people has a hive-mind, the initial enmity against Blacks has varied from almost nonexistent to relativelly innocuous or restrained to unbridled depending the sociocultural context at times. Yet, for some odd reasons, both Christian, Islamic and even atheistic Blacks hold more grudges against Jews for the
very many downsides of these past five centuries of close interrelationships than the rest of white people who weren't any better because "jEwS kILLeD jEsUs" (Christians's excuse about their bigotry) or "bEcAuSe tHe jEwRy rUlEs eCoNoMy aNd pOlItIcs" (Moslems's excuse... which is a nonsense given that they didn't mind having Jews controlling economy and educational enlightement in much any Islamic empire north of the Sahara and in Western Asia. Neither to have a Quraych tribesman who reportedly get versed into mystical arcanes by Jews and being himself of part Hebraic ancestry as their most beloved prophet) and-- well, fuck these atheistic hypocrites for as much as I know, they're not even religious so why being religiously bigoted?
Well. My two cents.