In Spain, tío and tía are used with friends, depending on group/region. Calling a stranger that? Not friendly, but neither openly hostile. On the other hand, i

In Spain, tío and tía are used with friends, depending on group/region. Calling a stranger that? Not friendly, but neither openly hostile. On the other hand, it's common to refer to third persons as "un tío" or "una tía" the same way you'd say "some fellow" in English.