I never talked much to people that use a lot of expressions, and the usage of Spanish terms, like “nada” or “amigo”, as I could observe from the outside, felt inconsistent. And upon thinking on that, it got me curious, is it common to use such expressions or not?
We see and hear a lot of Spanish in California. So many road and city names are in Spanish. It’s the #1 foreign language to take in school. Hispanics are the #1 minority in California, maybe even the majority. At the very least you would know food names. If you go get street tacos, depending on their English proficiency, there’s a chance you may have to use some Spanish to order lol. Also people might speak and throw in some Spanish words in a funny ha ha way. Not everyday, but it wouldn’t be uncommon. It’s all very natural.