The Displacement of Palestinians and Syrians

There's been this mass displacement of palestinians and then syrians. And i was wondering your thoughts on this as a cause of discontent with israel. The numbers under dispute jews that were living in egypt, few in libya, some in morocco, algeria,. Some in the gulf states, some in jordan, some in syria. They were all forcibly removed and sent packing with nothing. So they were ethnically cleansed from the arab world. My point is not that that doesn't happen in war, but why aren't they calleda refugees? Why do we call east prussia 'refugee' when there are 13 million