Cockerels can be hard on pullets as their hormones are raging and the pullets won't put them in their place like older hens will (they don't put up with any nonsense from little upstarts). By the time they are about a year old they tend to calm down. If you already have older hens that will help him to be a good boy. If not then you may have to separate him temporarily if he becomes too abusive, just until he's past the raging hormones phase.
Between 3-4 months old is when you might start to see some bullish behaviour from him. He may start to distance himself from you as he starts to take on the role of flock leader so you'll need to respect that and give him his space. But our bantam rooster still puts up with being caught and picked up by our kids. We like to give him the food so that he gets all the glory of calling the girls over and providing for them too. I feel like that's one way of showing respect for his role in the flock.
I haven't had any issues with our bantam cockerels and roosters in relation to them attacking people, but it's very much a wait and see situation, and it can't be predicted as to whether they will be good, or little monsters. I have had more issues with larger breed cockerels with some going after our 10 year old son (he's the youngest so they must view him as the weakest link). All of ours are well handled so I don't think the amount of handling has much of an impact - it's more to do with genetics and hormones.
Our little bantam rooster is the sweetest little guy and has always been a perfect gentleman to the girls (he grew up with older hens in the flock) and to us. We love him and his son, who was raised by a hen, so isn't overly friendly, is just as sweet and funny. I sure hope your boy works out and you can keep him.