re: Someone please explain the historical hatred of Jews...

I can't explain it because it makes no sense. Even if the Jews did some things that might have annoyed some people, the sense of decency and tolerance that every Christian should have could in no way ever have allowed the egregious examples of ill-treatment that we've seen in history, past and recent past.

In sum, this historical ill-treatment has been extremely harmful to Humanity, past and present, because of its gross level of Evil.