While a legitimate strategy, a lot of gamers hate campers because most of them have no clue of what they're doing. They usually don't play the objective, doesn't play with their team and some just hangs out at a corner waiting for someone to pass by.
It kinda throws me off when my parents' current dog doesn't automatically hate you. A guy around my neighborhood walked right up to me while I was walking her and she didn't even bark. My mother thought that something must be wrong and she wasn't being a "guard" dog. I just figured she had no beef with dude. But she damn sure went postal on a couple other people and she doesn't play people coming up on their porch.