I suppose I'm willing to give some people the benefit of the doubt for simply not knowing anything about cycling protocol. I recently saw a couple (married or not, I don't know, but obviously poor) who had ridden down the street (actually, on the side-walk) in sub-freezing temperatures on cheap "mountain" bikes, wearing hoodies as their primary protection from the weather, to pick up a few things at the corner convenience store.

As a fellow "person who rides their bike as transportation," I felt a sense of solidarity with them, thinking "That's impressive, I'm not sure I would ride in this weather." (Of course, I have the option of driving my car in bad weather...they may not). I doubt they have any idea that riding on the road is safer for everyone involved...and in this case, for their riding speeds and bikes and skills and a mostly deserted sidewalk vs a very busy street and intersection, I'm not actually convinced that it would be.

(Kid in the OP is exempt from this feeling of solidarity, as he obviously has no regard for other people).