I very much agree with all of this:
I run two other forums and this same sequence happens. "Wild posting teens" come on, they are treated kindly, they realize that the forum is different than other ones they've been on, and often they adjust and become amazing forum participants. It's like running a boys & girls club and bringing in street teens, and watching them develop into amazing young adults. It's very rewarding.
We all learn from our peers and the people we interact with. It's up to experienced posters to model appropriate behaviors.