Please don't pick the most irritating point in an article to comment on just because it's so irritating. This is the most minor thing that he had to say.
May be that is a minor case to a US citizen. But might not be to a wider world of audience. He might not like it, but if he had any respect to his wider reader, may be he should not have wrote it. But then again, I know US tends to be more relax or loose in these sort of things. I guess it is a culture crash.
The original point was minor, if provocative. Unfortunately, though, posting an HN comment about a minor provocation can actually have a major effect on a thread—especially if it gets upvoted to the top, as indignant comments often do. That's why we moderate those and why I replied to you. The fault lies more with the upvoters and repliers than the original commenter, usually—but it's a co-creation. We all need to resist it because it leads to much shallower and less interesting discussion.