who cares
A reply to an unimportant or irrelevant statement, indicating indifference on the part…A reply to an unimportant or irrelevant statement, indicating indifference on the part of the speaker.
Meaning
2 senses(colloquial, rhetoric)A reply to an unimportant or irrelevant statement, indicating indifference on the part of the speaker.
(colloquial, rhetoric)A reply that dismisses the importance of another speaker's immediately preceding statement.