I have 11 bicycles and ride every day, so I'm not anti-cyclist.
I'm actually anti-car, I'm just saying the guy shouldn't have been on the sidewalk. I'll admit, that I haven't rode a bike on that street, so I'm not sure what it's like on a bicycle, and I might even be inclined to take to the sidewalks if it wasn't good for bike riding. But if I had a motorized bicycle (I badly want one actually), then I would definitely ride it on the street, not the sidewalk. That stretch of road is also relatively level with few, if any hills. So maintaining a reasonable speed shouldn't be a big deal.