To nitpick; to complain or find fault over trivial matters (an idiom meaning to pick at minute details).
上司はいつも重箱の隅をつついて、小さなミスを責める。
The boss is always nitpicking and blaming small mistakes.
そんな細かいことまで言うのは重箱の隅をつつくようだ。
Pointing out such minute details is like nitpicking.
会議で重箱の隅をつつくのは時間の無駄だ。
Nitpicking in meetings is a waste of time.