以人廢言

yi3 ren2 fei4 yan2

to reject a word because of the speaker (idiom, from Analects); to judge on preference between advisers rather than the merits of the case

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以人廢言|以人废言 [yǐ rén fèi yán] ► to reject a word because of the speaker (idiom, from Analects); to judge on preference between advisers rather than the merits of the case