Words can hurt. More than a punch, a slap in the face. Words, once they are said cannot be taken back. They are out there forever, ringing in the ears of those who heard the words.
Some words are meant to be cruel. Others blast out unintentionally causing damage. The pentup frustration, sadness, anger, and bitterness of a situation comes out in the words. Other words come out, and they are heard wrong. Wounding when it was not the intention and no explaining will soften the blow.
Be careful what you say. Once they are out there, you cannot take them back.