Proverbs 26:4 Do not answer a fool according to his folly, or you yourself will be just like him.
There are times when answering someone who is causing trouble will only lead to more trouble. Sometimes people are just out to cause trouble for the sake of it and the best way of diffusing that situation is to keep quiet or ignore them.
It is sometimes difficult to know when to answer and when to keep quiet, but if you will ask yourself what you think God would do in this instance before answering, you will have a better chance at doing the right thing!
God wants us to live peacefully with others, not to live under the threat of war all the time…