so what?(also what of it?) used to say that you do not care about something or think it is important
[TahlilGaran] Dictionary of Contemporary English ▲
so what informal Used as an impolite reply showing that you don't care about what another has said.
Roy boasted that he was in the sixth grade, but Ted said, "So what? I am in Junior High." Synonym: WHAT OF IT.
[TahlilGaran] English Idioms Dictionary ▲