I asked because Sicily is right in the middle of the trade routes and immigration routes, meaning that a lot of muslims pass by and maybe land there. So it could be imported, but it sounds like there might be a healthy dose of home grown as well.
One half of Sicily is considered Greek. The other half (around Palermo) is considered Arabic - certainly the Islamic architecture, which is quite beautiful, points to that. But I do think the Jew-hatred (not everyone, of course) is left-wing. They also hate America. Don’t get them started!