だから何なんだ

expression

so what?; who cares?

A blunt, dismissive response to a statement, implying that the speaker finds the preceding point irrelevant or unconvincing. Often used in arguments or casual retorts.

• 「遅ち刻こくしたのは電でん車しゃが遅おくれたからだよ。」「だから何なんだ。言いい訳わけは聞ききたくない。」

  "I was late because the train was delayed." "So what? I don't want to hear excuses."

• 「彼かれはお金かね持もちなんだって。」「だから何なんだ。性せい格かくが悪わるければ意い味みがない。」

  "I heard he's rich." "Who cares? If his personality is bad, it doesn't matter."