That's terribly un-Christian of them. Ask for the intercession of St. Monica. I think her example is appropriate. They should also take these words of Our Lord to heart as well.
You have heard that it was said to them of old: Thou shalt not kill. And whosoever shall kill shall be in danger of the judgment. But I say to you, that whosoever is angry with his brother, shall be in danger of the judgment. And whosoever shall say to his brother, Raca, shall be in danger of the council. And whosoever shall say, Thou Fool, shall be in danger of hell fire. If therefore thou offer thy gift at the altar, and there thou remember that thy brother hath any thing against thee; Leave there thy offering before the altar, and go first to be reconciled to thy brother: and then coming thou shalt offer thy gift.
-Matthew 5: 21-24
Thank you. St. Monica would be a wonderful intercessor here!