Technically, the Arabs sided with the Nazis as part of an attempt to destroy the Jews in British Mandate Palestine, rid themselves of British rule and form some kind of Tribal, failed state of which these people are experts.
Even T.E. Lawrence said, (at least in the 1962 film) circa 1917, “Sherif Ali, so long as the Arabs fight tribe against tribe, so long will they be a little people, a silly people, greedy, barbarous, and cruel as you are”. What has change with these people since 1917????
True. And asides from ‘practical’ alliances, ideological hatred was THE major part. And Arab Islamists have been fusing radical Islamism with racialist-Nazism ever since the Mufti approached Nazi Germany in 1933, with only 2 months of Hitler’s ascending to power.