Avoiding the obvious title
CONJECTURE: The phrase “just sayin’” is shorthand for “I’m a total dick but I’m pretending that I don’t want to offend you”. That’s how I use it, anyway. If this were a real blog, I’d provide a link to some more thought out essay on this topic (which I swear I saw once, somewhere out there).
And if I wanted to be ironic, I’d end this post with the phrase in question.