Well I thought the phrase was really "I couldn't care less (about x,y or z)", ie. "I don't care at all". 
Re: "the other discussion": this thread was started to let people vent a little on words or phrases that upset them in general. So I think it's only fair to let everybody say which phrases upset or offend them no matter what they are and no matter if you happen to use them. No-one's decreeing that you can't say this, that or the other, and as long as it's mentioned in a reasonable manner I find it rather enlightening what bothers people.
Sorry, that syntax sucked.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett