California is really interesting actually. Yes over all they are a blue state. But the blue comes from exactly where you think it does. The metropolitan centers of the state are where the majority of people live. But the majority of agriculture comes from the valleys where people are much more right leaning. California is so politically diverse that there is regular infighting about breaking up into multiple states. One really commonly petitioned and proposed split is the creation of the State of Jefferson.
https://en.wikipedia.org/wiki/Jefferson_(proposed_Pacific_state)
But also, Northern California and Southern California regularly are seen as in opposition to each other. Central California feels completely different than any of the aforementioned regions. Then there is the desert area.
The real reason it could stand on its own as a country is because of that diversity. Not to mention, if California split from the Union, in theory, the USA would have to continue to import goods from them because of how reliant we are as a country on that singular region.
I know this is a joke but if you ask for black coffee or unsweet tea, you will get what you are expecting in most cases. They may ask as a courtesy if you want sweeteners or creamers with that because many people wish to sweeten their drinks themselves as they may prefer artificial sweeteners or wish to control their dairy or sugar intake for dietary reasons.