One courtesy that boaters observe at a dock like this is that after they come ashore, they move their dinghy out of the way so others can get to the ladder; the dinghy on the right in the photo above did this. Otherwise, they tie their dinghy on long painter (the line that goes from the bow of the boat to a cleat on shore). This keeps your dinghy secure, but allows a latecomer to move your dinghy out of the way to access the ladder or dock so they can also come ashore. Here's a bit of a closer view of the less-courteous boat on another day, looking back from the land side, do you see what's wrong now?
It's going to be tough for anyone else to get to the ladder, since this person has chained their dinghy so close as to take up all the available room.
There's another dinghy-dock courtesy that says that wherever tides and water depths allow, you don't leave your outboard halfway up with the prop out of the water. The theory here is that you could bounce on a wake or a wave, and your prop could come down and cut someone else's rubber tubes. But that's not the problem in this case, the dinghy in question doesn't have an outboard, apparently they row. Here's an even closer shot of the problem, do you see it now?