I don’t agree with that person in amy way, they are a suspicious character. I think they are a transvestite, likely the gay black on this site. I don’t like them or trust them BUT

When you really think about it, I COULD CARE LESS means there is room to care less. You could care less. You are not rock bottom in the caring department.

I COULDN’T CARE LESS means there is no more room to care. You are at rock bottom of caring.