Looking at it from his stand point he isn't blocking the ramp. He's next out. Your boat is at the other end of the dock and it's anybody's guess why. If you can power on and use the center (no dock) without going in front of him great. But it sounds to me like you could not so you should have been the one to "block the ramp" since you were there first. Then it would have been clear what was going on and there would have been no issue. This "blocking the ramp" seems to mean that others should always leave room for the sleds to jump in front and power on as they see fit. To me, when sleds do that, it's not good ethics.