Dinos-rock, the personality on a bird is determined by two primary factors....genetics and environment.
I can only speak for myself on the genetics piece, in that we select only good natured birds for our breeding whenever possible, which ensures (in most cases) the offspring will carry the same disposition. Hatcheries, in most cases, breed in such large quantity that they do not pay attention to that specific of a detail on their birds.
Environmental conditioning starts as a day old chick, right through to adulthood - just like with human children. If the chick does not get enough attention and correction as it grows, it will turn out as you describe. With ongoing attention, nurturing and corrections, a chicken can (in most cases) be conditioned to have a great personality. Again, this can also go back to genetics and not be the final result due to poor breeding.
And then there are just birds on occasion that don't fit into the scheme of things, regardless of what you do. There is an exception to everything, so this one bird definitely doesn't depict the overall nature of the breed and could very likely just be an exception. I hope you will try orps again and get some wonderful representations of the breed.
Jody