I'm agreeing with those who are saying that it all depends on the line, though some could be their nature to a degree in that some birds may do well being raised with little or no handling and still be friendly, while birds from that same line get flighty and nervous from being handled a lot or 'hand raised' as some call it.
My RIRs were always very calm and friendly and wonderful to be around even the roosters, and I'm not a big believer of too much fussing when they're little. That always seems to set them up for panic mode too much. I like to be able to pick up my birds to check for problems and treat injuries or illnesses, but I don't fuss much over them otherwise. In fact I usually wait till they're on the roost and the coop is closed up to handle them much, they tend to calm back down quickly and get better used to handling and such that way.
I think if I got wacky birds of any breed, I'd just not get them from the same source next time if I really wanted some again.
My RIRs were always very calm and friendly and wonderful to be around even the roosters, and I'm not a big believer of too much fussing when they're little. That always seems to set them up for panic mode too much. I like to be able to pick up my birds to check for problems and treat injuries or illnesses, but I don't fuss much over them otherwise. In fact I usually wait till they're on the roost and the coop is closed up to handle them much, they tend to calm back down quickly and get better used to handling and such that way.
I think if I got wacky birds of any breed, I'd just not get them from the same source next time if I really wanted some again.