Since you didn't add anything other than an unwarranted attack on the person you're replying to, this falls under “Avoid gratuitous negativity”:
In this case, this subthread could've been nipped by mentioning that it's ok to be abrasive to an extent as long as it's followed by a substantive comment. It's not diplomatic, but it's not against the rules.
The guidelines are the framework the community is built around. They're not sufficient to explain why the community is built around them. (We probably wouldn't want the guidelines to be so complete, either. It's better to explain the motivations on a case-by-case basis.)
You could be right. But if you were in their shoes, you'd want to be given the benefit of the doubt.