I had the same trouble with a couple of my roos. The thing is, chickens think everyone is a chicken. So no matter what you do, theyll think youre a chicken doing it. We had a roo that use to attack every stranger that approached the coop. His name was broke beak. (Long story about the name) When i use to walk down the path to the cook to feed the chickens he would meet me in the middle and do his side shuffle with his wing dragging the ground until i dropped some food. It all came to a boil with me when i was feeding the chickens inside the coup and he came around and flogged my leg while i was squatting down. I was like, "i know he didnt just attack me". I kept on feeding the chickens and when i rose up, he attacked me again... I gave him a massive kick... Knocked him about 6 yards or so away... He never gave me trouble again... He was always submissive to me after that. Him and our other roo (Foghorn) a white leghorn use to chase my children around the coop dragging their wings... I knew they were trying to establish their pecking order with them too... When my sons started calling for me, i went out and intercepted the roos again with a big kick... They stopped chasing them after that... They were like pets to everyone in the house after that... Any stranger that came to look at the chickens were met with aggression.... I didnt stop them from that, they became like "watch chickens". I said all that to say, he is viewing you as a peer and will/is try to establish a pecking order with you... If you meet him with aggression (like an alpha roo would) he will stop that agression towards you... If you dont, then he'll always try to keep you in check when you come around... Our roos were a year old when they started doing this... Before that, they were gentle. But after i put them in check, they again became gentle to my family.