because they take land from people.
imagine someone just shows up at your door one day and says, you don't live here anymore. it is now my house, how would you feel?

Anti-semitism has its roots in economic and social segregation in early Renaissance Europe. Jews were excluded from the nobility who were landlords, and the nobility considered certain professions uncivilized, such as handling money, loaning money, investment, medicine.

Judaism also highly stresses education, so Jews dominated highly technical fields, and later were prevalent in the academy. Excluded from the economy, many took up trades that were passed on in families. Many Jewish surnames reflect that, such as my great grandmother's family name "Naegel" which comes from "nail" in German.
So as a truly modern economy forms, Jews were prevalent in finance, medicine, and new opportunities.

So a narrative forms that Jews are exploiting people, are money hungry, manipulative. Just like many narratives about large companies now-- except they are tied to Judaism. It's also tied to the Biblical narrative as the Jews are associated with the degenerate money changers that Christ challenged.

Jews were also in closed communities. Observant orthodox Jews also have very strict religious customs that set them apart from everyone else. Some of them are very quirky. And from that comes a sense of being entirely "other" to the rest of society, and one of the things that gets you is taking on superstitious ideas that float around society. People believed Jews were "shape shifters". They also believed Jews needed the blood of Christian babies to put into their matzohs. This sort of tracks the vibe of financial and economic parasitism.

So on the dawn of fascism in Europe there are people systematizing these ideas. Racial eugenics. Systematic presentations of anti-semitism like "The Eternal Jew". Of course this is all driven by social and economic crisis in central Europe, but the eternal Jew had long been the eternal scapegoat.

Zionism made it worse, particularly after the formation of the nation of Israel. Zionism preceded that, and preceded the shoah, the holocaust. But the formation of the nation of Israel after the holocaust, and the subsequent defense of Israel from its enemies then forever coupled American politics and military interest to Jewish identity. Whatever one thinks of Israel and Palestine, it's not a burden of every Jewish person.

And then there are a series of paranoid fantasies that come from Jewish presence in the media. That the holocaust never happened and was a fake in order to garner Jewish sympathy for Zionism. That they are the mastermind of a communist and liberal social agenda. This is a newer theme. I don't understand it as the Jewish banking conspiracy seems to be at odds with communism.

I figured I'd try to give a real answer as I was raised to be an anti-Semite and white supremacist. Now I'm not. It's really fascinating as you can see all these themes all over the internet. 4chan/pol is full of it. There's quite a bit of it here. I have witnessed Christian pastors echo a fair amount of this. And this shit is all centuries and centuries old.

I’ll just add a couple quick thoughts as this post covered a gambit of trajectory.

Not disagreeing with anyone!

As short as I can say it, Jews do not believe Jesus has come to earth yet. They believe he will come one day. This flys directly against Christianity which believes Jesus has already come to earth and will come back again one day. Bottom line, at very least, one of them is wrong.

I believe Jewish is the only religion that is also a race.

This reason is just something I thought about. I could be wrong! Religions like Christianity are heavy into recruiting. To the point of being annoying. I think this gives an appearance of open acceptance. Jews do not recruit in that manner. In fact they are supposed to kind of act indifferent or almost ignore anyone’s initial inquirement into joining the Jewish religion. This is only done to ensure the inquirers desire is genuine. However, it’s unintended side affect is that it can come of as elitelist and unwelcoming.

The holy city of Jerusalem is claimed by both Jewish and Muslin faith. 1000 years back and beyond it changed hands veyeeen the two rivals many times. But when the Muslims last took control in the 1300s they held on to it until the end of WW2. When it was seized from them as part of the punishment for being on the losing side, and used to establish the Israel state.

Because like all ignorant people they tend to think every Muslim is a terrorist. Every Jew is a zionist every black person a crack addict and every white person privileged. Ignorance.

Because some of us can kick ass.

Money money money its so funny, in a rich mans world

Hatred of that kind is irrational regardless of the ethnicity being targeted. It is often displaced anger leftover from other situations in the prejudiced person's life which are frustrating or humiliating.

no hate /but not a fan
their Sanhedrin liked crucifictions

Are you jew?

It is the new way to "speak your mind' blatant racism has been made ok. This has led the real crazies to then think they can do as they choose.