They took their land from them, and have continued to take land since 1948. Actually, the U.N. did that, which we're part of, but Israel didn't complain. With the numerous atrocities that Israel has also committed, I don't see how they couldn't feel animosity toward Israel. They happen to be Jewish, but its really the Israeli and U.S. governments that are responsible for the hatred, not people of that religion. Zionism is the problem.
Welcome to the real world, where when you brutalize people and commit genocide over generations, their surviving family members and friends, and others in their ethnic group hold grudges against you forever and some will do whatever they can for vengeance.