I often think we could do with an "Oh FFS" button on Facebook or LinkedIn for those moments when you think you have carefully crafted a post and then the first comment comes completely out of left field and takes the ensuing comment thread in what feels like the wrong direction.

But is it the wrong direction?

Is the frustration you feel caused by your failure to write the post carefully enough to close off other views? To win the argument before you even knew there was one?

Or is it because you are resisting the discomfort caused by the fact that the commenter sees the world so differently from you?

They appear stupid because they "don't get it" but they actually trigger something. Something you don't like. Something revealing. Something more revealing about you than about them?