I know everyone has their own methods, but the story of "the little cockerel was soooo sweet and lovable then he turned aggressive when he got older" gets repeated here over and over.
When kids are a bit older, whenever we raised chicks, we allowed the chickens to be chickens. We taught the children to walk into the chicken area with a stick. We do the same thing now with the grandkids. Nothing particularly menacing, just something to always take with them. I know a lot of folks like to make pets out of their chickens, but in far too many cases the cockerels simply do not lend themselves to this. The cockerels can be precocious as chicks and thus, people often mistake this for being "friendly". But when a cockerel becomes a rooster, his hormones and his genetic pre-disposition kicks in. They are designed by nature to be breeders, dominant, watchful, wary, and sometimes, even protective of their hens. This is their DNA. This is their purpose, via nature.
We do not schmooze up the young cockerels. We are bigger and we stay bigger in their eyes. We respect them and they respect us. I go about my business and expect the roosters to do the same.