Couldn't Care Less vs. Could Care Less

I am aware that my grammar is not perfect and I'm alright with that. I've noticed/fixed many mistakes on here and have surely made numerous others that I haven't caught. This one, however, gets to me every time someone says or writes it.

'I could care less about this' conveys that you must care at least a little bit, or that there is
an infinite possibility of how much less you could care. 'I couldn't care less about this' conveys just as it says. There may be other things you care equally as little about, but not less. I made this graphic as an aid.