Every Barred Rock I've ever had, has been mean, aggressive and feather pluckers. I only have hens and can't imagine a BR roo.
It is definitely NOT a breed trait. My BR roosters were wonderful roosters. It's not at all due to the breed--it's due to any rooster's reaction to the way children act. Let's be clear on that. Even a dustmop Silkie rooster might do the same thing if a toddler was making him jumpy and he can do just as much damage to a child's eyes as a big rooster can.
We do not want folks asking about what breed rooster is safe around children. NONE are. It's just the way it is. Never trust any rooster around a small child.