I keep seeing the same guy commuting the other way every morning. Looks like a poor guy, raggedy clothes, commuting on some generic freestyle bike. I get the impression that he bikes because that's the only mode of transportation he can afford.
So I hesitate to tell the guy to start riding on the correct side of the road. He's always on the sidewalk going against traffic. I doubt he's cycling for fun if he doesn't know that basic rule...Oh well. What can you do.