Taking your word for it and asuming that your particular F/O is stroppy. The fix is relatively straight forward. You take control and say thank you for your viewpoint - I have control. Then don't give him a leg for the rest of the day. Or the next day until he gets the message. He soon will.
But always be polite about it. Never reason with him and don't be suckered into explaining why you are taking certain courses of action.That is his cue to argue to the contrary whatever you do. Some people are born that way. If he cannot understand why you take a certain course of action, that is his problem - not yours. Unfortunately these characters exist in most airlines and you can either cringe in the left seat and give lame explanations in which case that type of character will seize upon your weakness and give you more stick.
Or you stop the chappie in his tracks. Prevention is better than cure. For some captains it is easy to put the stroppy one in his place. For others it is difficult depending on your own personality. None of us enjoy confrontation, but sometimes you have to cause a crisis to fix a crisis and for some that takes bottle.