Honest question, how is "I couldn't care less" usually mis-used? Using a made-up example, it's often said like this, "I couldn't care less how much you like XY

Honest question, how is "I couldn't care less" usually mis-used? Using a made-up example, it's often said like this, "I couldn't care less how much you like XYZ, I don't want blah blah blah." The person is saying that they don't care at all. As in, they couldn't care less... seems right to me! Just curious how it's typically mis-used.