No Jews have been treated well anywhere in Golus.
That’s what Golus is about. Hashem is reminding us we are not at home. (No, not even in Israel; that’s part of Golus too, today.)
That all said, however bad the Muslims treated us, the Christians and Europeans treated us far far far worse than the Muslims and Arabs ever did. Compared to the Christians/Europeans, our times in the Arab/Muslim lands was a comparative paradise, on a relative basis.