I have 3 roosters. All 3 of mine have gone after me. But I put them in their place. I know can go into the coop and they do not bother me. They don't get to close but they respect me. My daughter goes in all the time too. Now if my husband or son go in they go after them. It is because they don't go in the coop very often. I have found that if they get to know you they learn to not attack. Give him time. Just remember Roo's are their to protect the hens not be pets. This is just my opinion. Hope all works out well for you.
