This movie is not about punk, per se
I know this board is mostly dead, but I'd like to leave this here since I've watched this movie 4 times already and I usually don't do that with even my favorite movies.
The best quote I can relate to this was actually about fight club, when the author of the book said it could have just as easily been "golf club".
The main theme of the movie is struggle for identity. It's about losing the identity you once thought you had. Steveo loses everything, from his punk identity to his best friend. He finally ends up giving in to his father's dream for him, but we don't really get the feeling that he's found anything more substantial this go-around.
I had no interest in punk before this movie, and I can't really say that I do now. I think the "haters" of the film had too much attachment to the punk movement, either in the way of disliking it or seeing themselves as a punk. I can say that despite this lack of interest in the punk scene, this has become one of my favorite movies.
Someone mentioned that it doesn't have a plot. Sure, in the linear sense, it doesn't. It's more of a collection of scenes from Steveo's recollection of how he got to where he was at that moment. Frankly, the more I have rewatched it the more I have seen just how multilayered the movie really is. The device of him "retelling" the story is woven so seamlessly that it never gets gimmicky.
I apologize for the stream of consciousness. These are the thoughts that have been stewing in my head about this movie for the last few days. I have a feeling I'm going to rewatch the movie yet again this week. The characters really hooked me from the get-go.