I would always advocate apologising for the manner of your delivery in situations like yours.
i'm with bolina. i've been in the same situation with xABF where he is lying or whatever crummy thing he's doing and my response to him sometimes have been cynical, superior, and well, just plain mean.
it helps me to remember:
say what you mean, but don't say it mean.
i would take the higher road and apologize for screaming at him.
naive