I don't think it's snotty. The criticism is valid and straightforward.
Your comment, on the other hand, brings up the person's post history to make a personal attack. It doesn't address the point being made in any way. This is not the sort of behaviour that's expected on HN.
More interestingly, they picked a top-15 karma account to criticize. I'm guessing the GGP is a bit more well-versed about what is good HN commenting than GP.
Your comment, on the other hand, brings up the person's post history to make a personal attack. It doesn't address the point being made in any way. This is not the sort of behaviour that's expected on HN.