There are three ways of dealing with a problem we may be having with some other Christian:
FIRST - we can forgive and forget. SECOND - we can go to that other Christian and explain how we feel, with a view to restoring broken fellowship.
THIRD - we can say nasty things about that Christian and run them down.

This third option Is utterly wrong, but It is frequently used, and it has caused untold damage and hurt. The fact is, we are quick to spot the faults in other people but very slow to admit to any in ourselves.

It is very dangerous and risky to criticize another Christian. Why? Because, if we could see the One who stands behind him (or her), we would realize that we were criticizing one of the King's children.

Dare we speak ill of someone so precious to God, while that same God, the Almighty King of kings is listening? James tells us not to "speak evil" of, or to "judge" another Christian. But logically, if you love someone, you would not even want to say anything to hurt them.

But having said this, there IS a place for criticism. Jesus did not hesitate to point out the faults and failings of the Pharisees and others - to their faces - Luke 11:37-53.

What He said to them was the truth, and they were definitely NOT His brethren. Paul also made many critical remarks when
he wrote to the different
churches, but he was
speaking as an apostle, and
he kept his criticisms very
general.