As far as I can see, Zeuhl, disliking somebody, or a group of people, does not suggest "...that some races have an intrinsic inferiority compared with others which justifies discriminatory, abusive or aggressive behaviour towards members of that race on that basis". You just don't like them, that's all.
Despite my somewhat fatuous "crocodile" analogy earlier, I still maintain that some people develop a dislike of some groups, or races simply based on those that they have encountered. If they had encountered none or perhaps a very few I would describe that dislike as irrational (but nonetheless one they are entitled to hold). But once they'd met enough to form an opinion about the group as a whole their dislike of the group is perfectly reasonable. People cannot be expected to hold no opinion of a particular group just because they have not met all of them.
Telling people who they should and should not like is the beginning of a very slippery slope. I personally think this particular lady is a bit foolish to make such a broad and rash assumption (especially as some of the nicest people I know are Jewish). But it should be her privilege to like or dislike whoever she likes and she should not be fearful of telling other people.