persnickety
per-snick-et-y
adjective
Excessively fussy or particular about small, unimportant details; overly precise.
"She's very persnickety about her grammar."
Thesaurus
Synonyms: pernickety, fastidious, bigheaded, snot-nosed, stuck-up, snooty, proud, uppish, snotty, too big for one's breeches