[bobthepanda]

This is one of those colloquialisms that has become so commonplace that it actually becomes a part of the language rather than being incorrect.

https://www.oxfordlearnersdictionaries.com/us/definition/eng... lists it as a usage in North American English.

[ilikeerp]

Yes, when enough people do / say something wrong over and over again, it sometimes becomes normalised.

[bobthepanda]

Wrong would imply a right, but most interpretations of what is "right" are fairly arbitrary and mostly have to do with social and cultural hierarchy.

[ilikeerp]

Logically it's wrong. If you COULD care less then that means you do care to some level whereas most people mean you COULD NOT care less. Simple...

[xbar]

Those of us who know better bristle and retain pedantry. Consider semi-annual and biannual. Grr.