[Maceman]

You could care less? Well I couldn’t.

(Signed)
FR Grammar Nazi
;-)

[Robert DeLong]

Well, Mr. Grammar Nazi, you had better read your dictionary, as either could or couldn't care less are both acceptable and mean the same thing. 🙂

Though I do prefer couldn't actually. 🙂

[Equine1952]

How much less, couldn’t you care. 😜

[Robert DeLong]

In fact, I will make it eay for you.

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.

Is It 'Could' or 'Couldn't Care Less'?