Have owned four litters of labs and some goldens. They behave the way you train them, with one or two personalities being more "out there" than others. Ours were incredibly loving to new people, but barked at anyone that approached our house, attacked people who entered without us. One golden was so well trained we loaned him out as a therapy dog for people who were scared of dogs. He nearly attacked a mailman running towards us (sorry mailman!). One black lab in particular, Princess, she was a... well, a bitch, and kind of a bully. Animals have personalities too.
The myth of breed behavior is not good. It's the reason so many pitbulls are put down. They are absolute sweethearts until you abuse them and train them to fight.