"I can imagine that during Ida ,B.Well's times such a thing as being antisemitic in the Western countries didnt exist."

Yes it did! Both in Eastern Europe and Western Europe. Before that it was mostly "Jew hatred" until antisemitism got formalized to antisemitism in parts of Germany🇩🇪 etc.

Metanyahu's father wrote a book tracing the origin
of jew hatred/antisemitism back to ancient Egypt, thus the expulsion of Hebrews out of Egypt and Moses etc etc.
Lol..many folks dismissed that idea which seemed to assume there were European Jews and that they were the original Jews/Hebrews etc etc.
Maybe that's where Netanyahu got his hatred & dismissive attitude towards African people.