It's hard to understand what racism looks like when all the people are foreign.
It's funny that you mention you don't know any Jews. I don't know how much you know about the history of the Jews in Spain, but Jews have lived in that region since around 300 ADE, and Ladino is essentially a form of proto-Spanish.
Put another way, until 1500, Jews had lived in Spain for 800-1300 years! They're basically all gone now :(