(followed by with) To criticize (something) excessively(verb)
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Use "find fault" in a sentence
"By the time the band broke into its next number, “Texas Trilogy,” Miranda was on fire, playing with such passion that not even Bobby could find fault with her."
"They are flawless, with flecked stems and stout caps, and there is nothing to find fault with except for one thing—they are not belye."
"So grim had Thorin become, that even if they had wished, the others would not have dared to find fault with him; but indeed most of them seemed to share his mind-except perhaps old fat Bombur and Fili and Kili."