Going back to the original post, there is no question this FO's attitude is lacking. By putting up with it you just encourage this bully.
Most of the time a word to the wise is sufficient. This guy knows exacty what he is doing.
Reading the riot act is not necessary. You should always be polite and respectful, as though you had an audience, and not say anything you could regret later. A quiet word before the flight and avoid any conflict on the flight deck is preferable.
These guys know the game. They know you are the one ultimately responsible for the flight. No you don't have to be buddies, but there should be an "open, friendly and relaxed" atmosphere on the flight deck.
I don't think a stroppy FO (or stroppy captain for that matter) should be so easily wiped off as a "personality conflict" as it lets the individual off too lightly.
You need to politely illuminate the error of this guy's ways, or you are being neglectful of your own duties.
CRM includes keeping the lines of communication open, but always with respect.
If the going got tough, can you rely on this guy to back you up to the best of his abilities? If he can't see sense, offload him and find one of the majority FOs who are professional.