彼（かれ）の話（はなし）は割り引（わりび）いて聞（き）いた方（ほう）がいい。

You'd better take his words with a grain of salt.

彼（かれ）のせりふは割り引（わりび）いて聞（き）いてよ。単（たん）に売り言葉（うりことば）に買い言葉（かいことば）というだけなんだから。

Don't let what he said get to you. He was just getting back at you for what you said.