All flocks have a pecking order (and you are a part of it), if the rooster doesn't see you at the top, they will go after you to show dominance.
Our Java roosters were almost as docile as the hens, the RIRs are far more aggressive but definitely manageable.
Our first (LARGE!) RIR rooster charged me and my 3 year old son a couple of times at around 4 months old. He spent a couple of maintenance sessions upside down and/or tucked under my arm, and we have had no problems since. Nothing violent, just scooped him up and made sure everyone knew who the boss is.
After he submitted to the humans, everyone else fell in line and zero incidents since. This includes his two "brothers" that were close to the same size, just not as dominant. In fact, they will eat out of my hand now.
Past that, our limited experience is that a rooster is a rooster and will always try to be at the top of the pecking order. Some are just more aggressive at that task than others.