Considering that you very clearly understood the intent from context, it seems rather petty to point this out in an otherwise completely unrelated discussion.
The fact I "understood the intent" doesn't make it grate any less, whenever I set this phrase misused time after time by Americans. "I could care less" is literally the opposite of the sentiment you are trying to express.
> 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.
Thanks for your feedback. However, I’m going to stick with Webster on this one. Let’s also not forget that English has always been a hodgepodge of language mashups and slang.