Similar, but not quite the same type deal...
I'm fishing a bay on a local lake with a large island near the mouth of it. To give you an idea of the size of the bay and proximity to the island, I can cast and put my bait on the island or the shoreline at the other side of the bay. Good Friday a few years ago, I'm in there throwing a spinnerbait and a tube. The bigger fish would eat the spinnerbait when the wind blew, but it took a tube to coax bites when the wind laid down. There was a small tournament there, and 2 guys were fishing about 50 yards out in the lake on a ledge leading into the bay, which is a smart move given the water temperature, but they were only catching small non-keepers. I caught and released a limit, with a couple of fish in the 3# class. Shorebound bass anglers have to select their area based on water temperature and time of year, obviously and I'm just tickled pink, because they're eating! I'm reeling in my limit fish and here comes the boat, pulls up and stops 20 feet directly in front of me right where I'm fishing! I was speechless, and to this day it still angers me that I didn't say anything. So they ran all around the small bay I was fishing, pitching plastics into the island shore brush (horrid LOUD presentations I might add) and proceeded to catch nothing and spook all the fish out of the bay.
My dad and I fished team tournaments for 12 years and we never even considered crowding a shoreline angler, even if it was a key area for us. Ignorance! (This is not a complaint against tournament anglers as 90 percent of those guys wouldn't do that.) There is an unspoken rule among fishermen to respect other anglers space, but I think as the years go by, less fishermen respect that anymore.