You could care less? Well I couldn’t.
(Signed)
FR Grammar Nazi
;-)
Though I do prefer couldn't actually. 🙂
How much less, couldn’t you care. 😜
Merriam-Webster treats the phrases couldn't care less and could care less as synonymous, both meaning "not concerned or interested at all." "Couldn't care less" is the older and more obvious phrase grammatically, but it has been confused for so long that both are now defined. Additionally, the example sentence "it's impossible that [I] could care less" is the same as the intended meaning.