I flew with one guy for the last month, call it familiarity, when I asked for some vectors without asking, as the last trips were pretty much all the same. I realized I probably should have asked, and apologized. However when I make suggestions, I don't want to be blown off. It maybe your leg, but it is my License/Airplane. I probably would have had a beer call that evening for a debrief "over the 1st Pint" after that it comes across as an old P!sstank. Depending how it went, I would either pay for the 1st round and retire, or buy another round. I encourage a very level gradient, and expect the F/O to speak up. I would document the talk in an email to myself, if we had a similar issue after that I would probably have crew sched replace him.