As someone who has lived in Southern California 90% of their life, and Berkeley, CA the rest, I can absolutely say that it is true in my experience that Californians (and I obviously include myself in this set) will use 'guy' and 'dude' to refer to anything. Men, women, children, dogs, cats, cars, burritos.

Last week I got up from the table to throw the rest of my burrito away and offered to take my wife's as well by saying "Dude, are you going to finish that guy?" I understand it isn't "correct", and the English are within their rights weep for their language if they like, but it is not weird at all in coastal California.