Mendocino here (live in the US but visit Mendoza every few years). There are plenty of places one can go for coffee, but American-style coffee shops are not nearly as popular. Mate shops aren't a thing, but it isn't homebrew in the sense that people don't grow their favorite varieties of yerba mate plants in the back yard. You get a bag of yerba at the supermarket, have a thermos with hot water, and a gourd & bombilla. People drink it with friends, but, like coffee, it's also something they drink throughout the day by themselves while working, studying, etc.