From the beginnings of literature, poets and writers have based their narratives on crossing borders, on wandering, on exile, on encounters beyond the familiar. The stranger is an archetype in epic poetry, in novels. The tension between alienation and assimilation has always been a basic theme.
We notice in others only those things that relate to ourselves. For example, you could find someone hilarious and brilliant, and I could find the same person idiotic and annoying. It's the same person doing the same thing, but because we are viewing them from our own unique perspectives, they mirror back to us something different.