“Abstain from all thinking about other people’s faults, unless our duties as a teacher or parent make it necessary to think about them. Whenever the thoughts come unnecessarily into one’s mind, why not simply shove them away? And think of one’s own faults instead? For there, with God’s help, one can do something.” (CS Lewis)
We typically notice and get irritated by the same faults that we often struggle with ourselves. Shove these critical thoughts away! Try to see the good points in those around you. Inspire others with your example of holiness and leave the judging to God.