Ive had a couple of these idiots spout off since I've been in this game.
I started to leaflet and door knock a new area to work in about 3 years ago. Set up about 50 custies. After a couple of months, some bloke tips up a few doors down and starts working the windows. After about 5 mins I walk over and say hello etc and introduce myself. He gives it the "this is my patch" routine.
I said something like "what's the problem, lots of houses that we can both work on and more than enough for 2 of us" etc. No, it's his patch and windies should stay away when someone is already in an area etc.
He had around 30 custies he said, and at that time I said nothing, just leafleted again and pulled another 75 + custies. After about another 3 or 4 months, he told his custies that he was no longer able to provide a service and was moving away.
There are still mongs like this about. Easy to spot, as their knuckles have scratches on them where they drag them along the ground.