I came across this:
So – what do you think is going on? Is he responding to a passing group of his peers, perhaps from a better social class, snickering, ignoring him, or otherwise showing their scorn? Is he the leader of a gang trying to impress his underlings with his steely stare? Or is he just mocking the pedestrian world before him with with his glare of youthful defiance and derision?
Here is the entire photograph.