"Did you even read the article" is a cheap shot that commenters routinely take at each other. It has nothing to do with the topic at hand, so it adds noise, not signal. Since it's a putdown, it provokes others and degrades discussion. If you take out the cheap shot and preserve the correcting information, the comment becomes better in every way.
You can think of it as a special case of this rule: When disagreeing, please reply to the argument instead of calling names. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3." But it's a special case worth singling out, because it's so common, and it's bad for HN in two ways: mean and predictable.
You can think of it as a special case of this rule: When disagreeing, please reply to the argument instead of calling names. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3." But it's a special case worth singling out, because it's so common, and it's bad for HN in two ways: mean and predictable.