When we become irritated with the shortcomings in others, it means that we are focusing on the the superficial aspects of life and the deeper, more meaningful aspects of life are being missed. Life always progresses towards truth, but we all have shortcominhgs and make mistakes on our path. We miss the mark.
When we become annoyed with others and find fault, we need to question what it is, within us, that causes such irritation. Differences in personality always exist, but when the underlying Oneness of all people are realized, the inherent beauty within each person is revealed.
This is expressed by the saying of Confucius, "To be in one's inmost heart in sympathy with all things; to love all; to allow no selfish thoughts - this is the nature of benevolence and righteousness."
Also: "Our disease is that we neglect our own field, and go to weed the fields of others, and what we require of others is great, while what we lay upon ourselves is light."
Those who see their own faults have no time to see the faults of others. - Islam
How can you forget your own fault and busy yourself with the faults of others? - Bahaí
To attempt to correct another's virtue while one's own virtue is clouded, is to set one's own virtue a task for which it is inadequate. - Taoism
Pay attention to the shortcomings of yourself rather than with others. - Shintoism
Wherein you judge another, you condemn yourself; for those who judge do the same things. - Christianity