You’ve boiled a 1,000 years of history into that statement? Jews were administrators of whole provinces for absentee Muslim overlords in some cases, persecuted by moslems in others. I think there is massive ignorance of a very long history and snap judgments are made on extraordinarily limited facts. Basically, it’s polemics; trolls and the ignorant throw out some fact that supports some prejudice that they have.
That didn't mean there weren't periods where they were left in peace to prosper.
If that hadn't been the case Spain would have been just another Dark Ages sump like most the rest of Europe and vast stretches of the Middle East and North Africa.