Well that's not true at all. True, mostly Muslims treated Jews better than Christians have treated Jews, but that doesn't mean that extremist Arab Muslims don't have a consistent history of mistreating Jews. They do. Just because they mistreated Jews less than Christians doesn't mean they didn't mistreat Jews. "Resentment toward Jews perceived as having attained too lofty a position in Islamic society also fueled antisemitism and massacres. In Andalusian Spain, ibn Hazm and Abu Ishaq focused their anti-Jewish writings on this allegation. This was also the chief motivation behind the 1066 Granada massacre, when "[m]ore than 1,500 Jewish families, numbering 4,000 persons, fell in one day",[20] and in Fez in 1033, when 6,000 Jews were killed.[21] There were further massacres in Fez in 1276 and 1465.[22]

In the year 1354, Muslim mobs in Egypt "ran amok...attacking Christians and Jews in the streets, and throwing them into bonfires if they refused to pronounce the shadādatayn."[23]" - https://en.wikipedia.org/wiki/Persecution_of_Jews