の言うことなんて

what someone says

→ の
phrase Rare #29,383
what someone says Used to dismiss or belittle what someone says, often with expressions such as 信じない (not believe) or 気にするな (don't worry about it). The person before の is the one who said it.
JA: 彼の言うことなんて、気にしなくていいよ。
EN: You don't need to worry about what he says.

トムの言うことなんてほとんど信じてない

I hardly believe anything Tom says.

の言うことなんて気にするな

Don't worry about what other people say.

あんなの言うことなんて信じないよな

You wouldn't believe anything a woman like her says, would you?

— Carandiru (2003)

トムの言うことなんて信じない

I don't believe a word Tom says.