It seems to be very individual. Holderread states:
"Choose the breed you're most attracted to. After raising all breeds over the course of 47 years, we've found that in most cases personality and temperament depend more on the individual bird and its environment than on the breed. To reduce the likelihood of aggressive behavior at maturity, we've found it helpful to work calmly around geese of all ages, to never tease them, and to not feed them from the hand."
My own current "meat hybrid", Keld, is totally non-aggressive, never attacked anyone or anything, but the 6 geese I've had before him varied a lot - from climbing on my lap, to chasing especially cars, dogs and children but really anything within a 50' radius.
Come to think of it, Keld actually once attacked a neon green, shiny shoe. But that was months ago, and he never attacked anything else.