It is a legend of the Middle Ages that the Jews ate Christian meat on Passover(逾越節). Christians generally believe that the Jews had harmed Jesus Christ. When Europeans mention Jews, they think of loan sharks, Jews can lend to Christians,But Christians are strictly prohibited from loan sharking,Jews are generally socially excluded for loan sharking,In 1492, the Jews were expelled from Spain. In 1509, when the Cambrai Union war(康布雷聯盟戰爭) broke out, the Jews came to Venice for escape and lived in groups in an old cast iron factory. These Jews were required to wear yellow clothes or hats(https://zh.wikipedia.org/wiki/%E5%A8%81%E5%B0%BC%E6%96%AF%E5%95%86%E4%BA%BA)

In today's society, some people still discriminate others racial because of language, culture and color.