Too bad he seems like a bit of a knob. You have a choice, either live with it or escalate the authority of your position as others have indicated. It seems you have enough information to confirm that he won't respond unless he feels he must.
I hate it when some folks just decide they don't want to play nice. (My job deals with supervision a lot of awkward individuals, you can waste a lot of time trying to persuade them after you have enough data to know it's a lost cause).
Such a little thing that should, in normal circumstances be so easy to fix.
Good luck to you.