Sarcasm is anger's ugly cousin.
A prayer of Peter Marshall, which needs no commentary or introduction, only emulation:
I need Thee, O Lord, for a curb on my tongue; when I am tempted to making carping criticisms and cruel judgements, keep me from speaking barbed words that hurt, and in which I find perverted satisfaction. Keep me from unkind words and from unkind silences. Restrain my judgements. Make my criticisms kind, generous, and constructive. Make me sweet inside, that I may be gentle with other people, gentle in the things I say, kind in what I do. Create in me that warmth of mercy that shall enable others to find Thy strength for their weakness, Thy peace for their strife, Thy joy for their sorrow, Thy love for their hatred, Thy compassion for their weakness. In thine own strong name, I pray. Amen.
(cf. The Fruit of the Spirit (i.e., the Marks of a Christian) in Galatians 5:22-23)