LRdriver
IF diplomacy fails, point to the four bars on your shoulder and TELL the offending person that if he/she doesn't like the way you run the ship, he should take his/her concerns to the fleet manager.
Has always worked for me.
In the two cases that I have had to do so, the First Officer in question was demoted to a lower fleet....and he deserved all he got, as many others had complained as well.
SOME (a very few) never learn.