I have a 8 month old Speckled Sussex rooster is agressive with me, but all my wife or I have to do is holler at him or give a gentle kick and he turns tail. What's the worst he can do? The only time I get angry with him is when he gets aggressive with the hens or the Black Star rooster. I catch him and put him in solitary confinement for 8 hours or more when he really annoys me. I read here in another thread that you should pin an aggressive roo to the ground firmly from behind and then pinch the back of their neck lightly for a minute to establish dominance.
Not saying you need to do anything but protect unsuspecting people.