Simply - it is not wrong to say you don't like certain people.
But making an anti-Semitic remark is not saying you don't like certain people - it's being offensive and racist.
I queued in the bank yesterday, and an old lady next in the queue and in front of me turned to me and said "I don't want to go to that one ..." meaning the next vacent cashier who was an Asian man. She stood back for me to go to him, but i refused to move forward. the floor walker supervisor approached and asked why the old lady was not moving. She repeated her observation, and the supervisor enquired why she didn;t wish to be served by the Asian cashier. "No reason .." replied the old lady and reluctantly approached the Asian cashier who served her.
Had she said anything else there would have been a scene - caused by me. Something along the lines of "I don't want to occupy the same space as ignorant racists, but that's life isn't it?" said in a voice loud enough for the entire banking hall to hear.
The only way predjudice is to be elimiated is if it is confronted on every occasion when it rears its poisonous head.
Simply dismissing it as saying this woman did not like certain people is fudging the issue, and making it appear that her remark was simply a general observation. It was not, it was specific, poisonous, and illegal, and she has been treated accordingly.