Those who have to point out the fault should understand that it is also their duty to advance in Krishna consciousness. This requires they also see's the good in others. If they cannot see the good in others, a Vaishnava should not point out their faults. Otherwise, they will not be able to correct others with beneficience. If we wish to improve our critical mentalities, we should associate with those who have learned to see the good in others. We should not only associate with them, we should serve them, praying to develop their qualities.