As with anything in the Middle East, it gets pretty "complex":
- Collectively, Arab countries have accepted several million Palestinian refugees. These refugees have lived in their host nations for generations.
-But today, nobody wants anymore refugees- period. The answer is still "no" even if the refugees are culturally and religiously similar to the potential host nation.
- Palestinians have pulled enough stunts over the years to cause welcome mats to be rolled. Big stunts have included trying to overthrow the Jordanian government.
Some medium stunts were culture clashes. Open alcohol and hash sales, bars, and prostitution were permissible to secular PLO leadership- but very offensive to conservative Shia muslims in Lebanon. PLO leaders also exempted fighters from local prosecution under Lebanese law (sounds provacative, but the US has done that as well) and also exempted them from Lebanese taxes.
Small stunts are what occur the world over when thousands of armed, bored and loosely supervised 18-35 year old men congregate: Some drift into criminal activity, some simply become "unproductive humans", and some just act like jerks.