People have different interpretations of these things. If you see a particularly bad comment that deserves moderation, we'd appreciate your letting us know about it.
Yes, there's far too much snark and derision on HN. It's an internet forum after all. Surely you're not suggesting we should do less about it?
The "how is this comment so much worse" objection is based on a fallacy. You don't not get a speeding ticket just because other cars were going faster.