US usually persnickety [adjective] [disapproving] - giving too much attention to small unimportant details in a way that annoys other peopleHer pernickety style of managing was highly irritating for everyone.As a writer, he is extremely pernickety about using words correctly.
PERNICKETY
Meaning of PERNICKETY in English
Cambridge English vocab. Кембриджский английский словарь. 2012