To add to your observation. What have the Jewish people been doing for the past thousand years to merit this hatred? They're obviously doing something wrong, because it's helping fuel anti Jewish sentiment throughout 1000+ years.
Everyone from Tiberius Caesar to rainbow haired college commies had or have beef with them. That's not normal.
Personally, I think this can be pretty much broken down into 4 categories.
1)
Lack of assimilation. Jews have tended to follow the tenets of Judaism and that set them apart. This isn't unique to Jews, but it is an element. Most cultures and societies around the world are homogeneous.
Different
2)
A History or resistance. The 12 Tribes of Israel that settled in Judea have a very strong connection to the land, both historical and religious. They have also been conquered countless times and have had a tendency to rebel...at least until the Romans took Masada, then that part went largely went away until the Holocaust.
Conquerors tend to like when the people they conquer just accept that.
3)
Success. The Jews have always been successful. The whole reason they got into banking is because it was literally
the only profession they were allowed to enter and they thrived there. I'm not sure why, but there are a disproportionately large amount of very successful individuals who happen to be Jewish. Is it culture, religion, "God's chosen people", luck, etc. Idk. I just know what I have observed and that I'm not the only one who has made that
observation.
Jealousy
4)
World Changers. Piggy-backing off of point 3, many successful Jews have changed the world. Karl Marx is a great example of a Jew who created communism, and we all hate him for it lol. Unfortunately, this is where the Jews have, seemingly dis-proportionally, been linked to these either powerful or influential individuals. There was a time when "Marxist" and "Jew" was essentially interchangeable.
Stereotyping
Historically points 1 and 2 were the major issues; but, recently I think points 3 and 4 are the biggest reasons.
People on the left tend to hate Jews because they are, in their minds, part of the "haves" class. White, wealthy, privileged, *insert Buzzword*
People on the right tend to hate Jews, actually for similar reasons. They see powerful, wealthy, men who happen to be Jews, supporting causes that they think are fundamentally detrimental to their society. See: George Soros.
At the end of the day, both the left and the right elements that dislike the Jews tend to view them as a monolith, as opposed to the individual actors that they are.