I am a bit befuddled. You think someone on the Internet making a snide comment is serious enough for an admin to intervene? And you think anyone is isn't friendly should be banned? In your definition, few of us would be left. We all say things we think are OK and not knowing they will be taken differently than we meant. I do this often. I don't mean to be snide but it happens.
I agree the post in question as an asshole post. And, if someone disturbs you, just ignore them. If something rises to the level of being a troll, there is a process to get rid of them. See the Comments Section and the Community Comity Commission. If two members make a complaint to the admin then the jury begins. If the major votes, the outcome will be adhered to. Since this has never been used, why don't you give it a try. I'd love to see how the process works in real life.