There is reason for Arab nations not accepting Palestinians. It is exemplified by the experience of Kuwait.
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Palestinian communities allowed entry go to work to take over the nation that accepts them. They act as a separate ethnic group intent on domination, and do not integrate into the nation that accepts them. This is as true in Lebanon and Egypt as it was in Kuwait. The relations inside Jordan with Palestinians are uneasy.
This is visible in the United States Palestinian communities as well. They are the leaders of the anti-semitic hatred and calls to war in the USA.
Bottom line, there is little difference between the Palestinian's relationship to Israel and Palestinian's relationship to every other Arab nation.