Welcome!
You can try to reform him, and it often fails. That's why
@nuthatched gave you that message.
Cockerels can mature into polite individuals, or not and their brains are smaller than their testicles!!!
He does think that you can be pushed around, he's not a puppy or kitten (and some of them don't turn out well either).
@Beekissed.
@Shadrach ,
@Mrs. K , and others have good articles and information on threads about roosters, and there are many threads on this site about how cute friendly cockerels turn into attack birds.
I don't cuddle or handle my cockerels, they have to respect my space at all times, I walk 'through' them, they have to get out of my way out there. You can carry a bucket or something and 'accidently' bump him to get him to move, don't use your foot, it's more likely to give him something else to attack.
There's a learning curve for you all to see if bad behaviors increase, something that helps raising those next (don't baby them!) cockerels. By the time he's attacking people, smallest human to largest later, he's given signs that are clear when you've had more experience.
Why give him chances to bite? Don't pick him up! If you let him bite, tap him hard enough to be annoying/ uncomfortable on his where ever, as another chicken would do. Unfortunately he doesn't have any adult hens to make him humble, always very helpful when raising cockerels.
If you do have older birds, he needs them. Every cockerel isn't going to turn out well, that's just how it is.
Mary