Anti-Semitism is a sin. Racism is a sin. The heart of the "ism" is "I, self, me". It is ego-centric and ego is another way of saying "easing God out". 
I am always so embarrassed by "catholics" engaging in such behavior. What rank ignorance of the Gospels. What a sad state of affairs when priests, supposed men of God, standing in for Christ (?) act out this ancient calumny. 
When Christ was asked what is the greatest commandment he answered "Love God above all others and love your neighbor as you love yourself."   
When asked who is my neighbor? He responded with the parable of The Good Samaritan. The meaning of course is that everyone is your neighbor. Christ did not say except for that fat guy, or that weird girl or the L,G,B,T or those perfidious Jews; which of course would have excluded all of his friends and family, including his Blessed Mother.