> Antisemitism has been explained in terms of racism, xenophobia, projected guilt, displaced aggression, and the search for a scapegoat.[243] Some explanations assign partial blame to the perception of Jewish people as unsociable. Such a perception may have arisen by many Jews having strictly kept to their own communities, with their own practices and laws.[244]
> It has also been suggested that parts of antisemitism arose from a perception of Jewish people as greedy (as often used in stereotypes of Jews), and this perception has probably evolved in Europe during Medieval times where a large portion of money lending was operated by Jews.[245] Factors contributing to this situation included that Jews were restricted from other professions,[245] while the Christian Church declared for their followers that money lending constituted immoral "usury".[246]
> It has also been suggested that parts of antisemitism arose from a perception of Jewish people as greedy (as often used in stereotypes of Jews), and this perception has probably evolved in Europe during Medieval times where a large portion of money lending was operated by Jews.[245] Factors contributing to this situation included that Jews were restricted from other professions,[245] while the Christian Church declared for their followers that money lending constituted immoral "usury".[246]
From https://en.wikipedia.org/wiki/Antisemitism#Causes