Reckless words pierce like a sword - Proverbs 12:18
A man who lacks judgment derides his neighbor - Proverbs 11:12
Do not let any unwholesome talk come out of your months - Ephesians 4:29-32
So thing we just plain need to get rid of:
Harsh words
Men will have to give account on the day of judgment for every careless word they have spoken - Matthew 12:36-37
Name calling
Would you use the same words if Jesus was in the room? Let that be the test.