瓦釜雷鸣

idiom

mediocre or unworthy people occupying high positions; the thundering of an earthen pot (metaphor for empty vessels making the most noise)

From Chu Ci (Songs of Chu), specifically 'Divination' (卜居). The original quote contrasts the destruction of the great bell (黄钟) with the thundering of the earthen pot (瓦釜), symbolizing how the worthless are exalted while the worthy are cast aside. Often used to criticize corruption or incompetence in leadership.