I'm not sure the user realized how inhumane the word-choice was. After all, it was just an adjective in an otherwise wrong, but rule-compliant comment. And "useless people" is not a rare expression in online discourse.
I was aiming for "sarcastic", not "irritated".
Please just don't post like that at all. It only degrades the site further, regardless of how wrong or bad the original comment was.