It's petty to categorize people when God has clearly stated "As it is written, There is none righteous, no not one..." (Romans 3:10)
It's petty to hold a grudge when we can forgive. "And forgive us our debts, as we forgive our debtors." (Mat 6:12) Withholding forgiveness increases our indebtedness.
It's petty to be angry because someone didn't do something our way. "He that is first in his own cause seemeth just; but his neighbour cometh and searcheth him." (Pro 18:17)
"Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves. Look not every man on his own things, but every man also on the things of others." (Phil. 2:3-4)
It takes thought and discernment to treat others with proper consideration, regardless of what they do or say. When we strip away the selfishness, pettiness fades.
Do you know what happens when we consider others before ourselves? Life becomes more enjoyable and less stressful as we remove the faulty measurements and love sacrificially.
Instead of being trivial, let's be bountiful in love and consideration. We don't have to allow petty little things turn us into petty little people.