Why do we park in a DRIVEWAY and drive on a PARKWAY ?
Why do people on FR mention that they HEARD this or that, when they really mean they READ this or that ?
Why do people say "I COULDN'T care less" when the mean "I COULD care less" ?
"Why are computers and touch screen phones HARDER to use now than they used to be ?
Why do we call them apartments when they’re all stuck together?
You're WRONG, WRONG, WRONG!!!!
If you COULD care LESS, then that means you ARE capable of caring less. The whole point of saying 'I COULDN'T care less' is to underscore the fact that you COULD NOT CARE LESS than you already do at that very moment!!!
Think of the other extreme, CARING instead of NOT CARING: I COULD care more, or I CARE NOT care more? If you choose the latter then YOU WERE WRONG AND AGREE WITH ME !