Perhaps LL Cool J was responsible for the term "Cali" making it's way into the popular lexicon? This reminds me of something that's a bit of a bugbear of mine (although I know you said it in a light-hearted fashion Irishgirly). That's the folk who seriously debate the correct way to refer to cities, towns, etc, implying that you're not a worthy "insider" if you're not using the correct terms. For instance, some folk here in the Bay Area are very insistent that you're not a "real" San Franciscan if you call it "San Fran" or "Frisco". If you want to show your true cred, you either call it San Francisco, or simply, "The City".
I say humbug to all of that. Call it what you want. In my opinion, only relatively new transplants get so overly concerned about such things, as they are the ones trying a little too hard to prove that they have fitted into the culture of their newfound city.* Besides, culture and language shift over time. They are not absolutes.
OK, I got that out of my system. Thanks for bearing with me
(*Plus some of the natives who are stuck in their ways.)