Yeah if people knew about these things they likely wouldn't be as susceptible to hate speech.

Discrimination is born from fear and ignorance.

Your also forgetting history. Conspiracies theories about jews is extremely old.

You’re operating from a major fallacy. Greater personal experience with a minority group (in the course of normal life, not, e.g. in a state of war) makes it significantly *less* likely that a person will be racist against that group.

People don't need to know anything about a group to hate them. Simply knowing that they exist is enough for bigotry to thrive.

personally I was thinking around 500 - 1500. after that the empires were large enough that they were competing with Islam,  and South or East Asian religions.

Not really the first millienia. More like from the 1400 afterwards. The monotheistic religions lived in close proximity for a very long time. The feuding kings needed a scapegoat and a ralling point.

it was popularized by christians for pretty much the first millenia of European history because it was the only other religion in competition

Exactly. Knowing only a small handful of Jews probably makes it worse.

Because they hear stories about Jews and Israel. They hate the stereotype even if the don't know many personally

How do people even know enough about Jews to hate them?