It's my new tactic. I get on with things (I have to, I have two very young children) rather than let it drag me down. That way it doesn't affect the children as much and shows him that he can't get to me.
Of course it annoys me, I'd rather he was reliably cheery. But I can't let his moods dictate mine.
Had anyone tried this and did your dp/dh react differently at all? I suppose I'm hoping that my increasing distance might wake him up!