petty
pet-ty
adjective
Excessively concerned with trivial matters; mean-spirited or spiteful about small things.
"Don't be so petty about the bill."
Thesaurus
Synonyms: narrow, narrow-minded, small-minded, piddling, trivial, little, fiddling, unimportant, footling, niggling, piffling, lilliputian
Antonyms: grand larceny, grand theft