Over time and in history, there have been groups of people who have hated each other. The Jewish people have suffered and people have fought them. In addition to that, others have fought the Arabs and they have suffered too. One reason that the Jewish people and Arab people have fought is during the Crusades which was a war that also involved another group of people, the Christians.
The main problem and reason for the Crusades was because each religion, Judaism, Christianity and Islam all had a holy land for their followers and believers to travel to and worship at. Unfortunately, this place was in the same place for each religion. It was in the Middle East. This pinned the Jews against the Arabs.