backseat driver 喜欢指手画脚的人

“指手画脚”，意思是一边说话一边比画，形容随意发号施令或乱加批评（make indiscreet remarks or criticisms）。而“喜欢指手画脚的人”可以翻译为“backseat driver”，表示someone who tells others how to do things；a person who interferes in affairs without having knowledge, responsibility, or authority for doing so”。

例句：

尽管玛丽能独自完成这个项目，约翰还是忍不住指手画脚，告诉她该怎么做。

Although Mary was capable of completing the project on her own, John couldn't stop himself from being a backseat driver and telling her what to do.

别再缠着我提你的建议了。没人喜欢指手画脚的人！

Stop pestering me with all your advice. Nobody likes a backseat driver!