That's not a civil way to address another commenter, even if that commenter is completely wrong. If you see an error, it would be better to explain what it is, not call names. Interjections like "Sigh..." are an internet-forum form of rolling one's eyes, which isn't nice.

We all know from experience how much harder and more time-consuming it is to correct errors than make them in the first place—that's a big problem with internet discourse in general—but posting uncivil and/or unsubstantive replies isn't a solution.

Edit: unfortunately looks like you've been doing this repeatedly. This one is worse: https://news.ycombinator.com/item?id=12519373. Please stop posting like that.