Let's keep in mind that after 1947 and urging Israeli Arabs to leave Israel, Jordan didn't want them, Syria didn't want them, Egypt didn't want them and Libya actively discriminates against them [this is from last August]:
Libya has implemented a program of taxing all of its Palestinian Arab residents.
According to Al Jazeera (Arabic), Palestinian Arabs in Libya are now forced to pay an annual fee of up to $1550, and they have to endure a host of new humiliations as well.
PalArabs have been banned from working in various jobs, including education. Relatives cannot visit them. Those who own cars are being taxed for more money than their monthly salaries. Travel documents are expiring and not being renewed, yet the Arab League does not allow Palestinian Arabs from obtaining passports from the countries they have lived in all their lives.
Residents note bitterly that all this is happening while Libya made a big show of sending a ship of aid to Gaza.
All of this is in contradiction with Libyan Law #10 of 1998 which was supposed to grant somewhat equal rights to Palestinian Arabs in that country.
And here are two [update: three] more posters with relevance for anti-apartheid week: