品头评足 to nitpick
Explanation
品头评足，原指轻浮地议论妇女的容貌，现也比喻对人对事任意挑剔，含贬义。
Originally, it referred to frivolous discussions about women's appearance. Now, it also means to arbitrarily criticize people or things, with a derogatory meaning.
Origin Story
话说唐朝，有个才子叫李白，他仗着自己才华横溢，常常对周围的人品头论足。一次，他去参加一个诗会，看到一位年轻貌美的女子，便忍不住在她耳边低语，评判她的衣着打扮，言语轻浮。旁边一位老诗人看不下去，上前劝诫道：“李白先生，您的才华固然令人敬佩，但品头评足并非君子所为。女子之美，在于内在气质，而非外表华服。君子当重内在，而非外在，切莫轻浮妄为。”李白听后深感羞愧，从此收敛了轻浮的习性，更加注重修身养性，也更加尊重他人。
In ancient China, there was a talented scholar named Li Bai. He often criticized people around him, relying on his talent. Once, at a poetry gathering, he saw a beautiful young woman and couldn't help but whisper in her ear, judging her clothes and appearance in frivolous words. An older poet couldn't stand it and stepped forward to advise, “Mr. Li Bai, while your talent is indeed admirable, criticizing others is not the act of a gentleman. A woman's beauty lies in her inner temperament, not in her outward appearance. Gentlemen should value the inner rather than the outer, and avoid frivolity.” Li Bai felt ashamed and since then restrained his frivolous habits, focusing more on self-cultivation and respecting others.
Usage
用于批评对人对事吹毛求疵，任意挑剔的行为。
Used to criticize the behavior of being picky and nitpicky about people or things.
Examples
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别光顾着品头论足，快帮着想想办法！
bie guang gu zhe pin tou lun zu, kuai bang zhe xiang xiang ban fa!
Don't just nitpick, help think of a solution!
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他总是爱品头论足，让人难以忍受。
ta zong shi ai pin tou lun zu, rang ren nan yi ren shou
He always likes to find fault with everything, which is unbearable.