We have to be proactive about moderating anti-semitism on HN—which does appear, unfortunately, though of course not in every comment that someone happens to read that way. There is huge variance in how people interpret these things and we do our best to be charitable. (Also, I had better add that we do our best moderate other types of slur in just the same way.)
Let's assume you're correct. Such a point needs to be expressed thoughtfully and substantively, not snarkily in a way that pattern-matches to a slur. This ought to be clear from the site guidelines: "Comments should get more thoughtful and substantive, not less, as a topic gets more divisive." - "Eschew flamebait." - "Don't be snarky." - [etc.]
As I mentioned above, I was also startled by that post, because the obvious pattern-match was to something nasty.