A perfect example of human nature in action is that of a wrongdoer blaming everyone but themselves. We are all like that. Realize that criticisms are like homing pigeons, always returning home. The person that is being condemned will be unlikely to learn from it, but will be likely to condemn us in return.
Thus criticism is futile. It puts the person receiving it on the defensive, because it wounds the person’s pride, hurts their own sense of importance, and arouses resentment. Rather than condemn it is better to praise, and when you cannot praise to phrase your concern as a delicate suggestion instead.
Before criticizing others, why not work on yourself instead?