I think buttermilk can be a chillaxing whenever beverage... at least, that is how it is consumed in my house (although I myself fall under the "urgh, disgusting" camp, but that's mostly because I don't really like regular milk, either. To me buttermilk is, like... yogurt-y milk, sort of? I don't know if that is at all a helpful and/or appealing description, ha).