Most young roos don't know how to treat a hen...I've had a few that did well but it might have been because they got to see the older roo perform. Monkey-see, monkey-do with chickens, I have found.
As he ages and gets the hang of it all, if he is still excessively rough and isn't seeming to calm down much, you might review his status there at your place.
As far as a mean roo, most folks consider a mean roo one that displays unprovoked, confrontational behavior towards humans on a regular basis. Most of them try it on for size at least once and it depends on the reaction he gets if he wants to continue. An immediate, excessive(over the top) negative reinforcement is needed and shouldn't have to be repeated if you have a smart roo. So far, I've had ALL smart roos...not one really came back for seconds.
I like a cocky roo that will confront cats, hawks and other small animals....nothing wrong with that and he's just doing his job. One that tries to tackle the dogs that are looking after him or the humans who are doing the same? They get schooled rather quickly by both dog and human at my place. There is a hierarchy at my house and roosters fall way down the scale and the sooner they learn it, the better.