A person who constantly focuses on the negatives, faults, shortcomings, and slights of others is a person not controlled by the Holy Spirit and perhaps an unbeliever. Bitterness, resentment, a critical spirit, holding grudges, and the like are works of the flesh, not of the Spirit.

John MacArthur Commentary on Philippians

A wealthy man was moving into his mansion, and his Quaker neighbor, who believed in the simplicity of life, was watching the activities carefully. The neighbor counted the number of chairs and tables and the vast amount of bric-a-brac that was being carried into the house. Finally, he said to the lord of the mansion: “Neighbor, if thou doest need anything, come to see me and I will tell thee how to get along without it!

Warren Wiersbe in Be Joyful