Well, I would not even DREAM of taking a nap out there on my clothes, on the sidewalk, no matter how tired I might be! So anyone who feels compelled to rest ON THE SIDE OF THE STREET looks homeless TO ME by default (as it were).
So yes, I do see the story behind this photo, and do see why it is called (sarcastically so, I assume) "Life underneath you" ... she isn't bothered in the least, just walks by and doesn't even look while she might just about step on his hand. Without the lady, there wouldn't be half the story.