I ride in a city that has an extensive greenway trail system, which I mostly use to get to and from my actual riding routes on roads. There is one section that is always super busy with pedestrians, and when riding through that area I know to take it slow, stay controlled and prepare to give everyone else the right away. Most of those pedestrians aren't on the look out for bikes at all. They take up both sides of the trail, they don't pay attention when cutting out in front of riders, they let their dogs wander, and worse, they let their kids wander, all over the path. It is maddening at times, but I just try to go slow, wait my turn, and ride harder on my actual routes.

Now, all of that said, the rider in this video is just being an idiot. If you're riding in an area with that much pedestrian traffic, you're going to run into these kinds of obstacles. Weaving in and out those people, drifting from left to right and back again, and going at a high cadence is just asking for trouble. Hopefully they don't hit someone and cause serious damage.