Kendall's definition of (good) manners as behaving in a way that help others to be comfortable, is as good as you can have. "Etiquette" all too often is more about making people uncomfortable, because they don't know the rules.

The other way of doing that is by bad manners, and my impression from that post by "GUEST from Sanity" is that that may be his, (or conceivably) her, preferred way of doing that.