This is very accurate. Even here. Metalheads, in my experience, are generally really chill people looking to have their type of fun. They might try to look scary, but they're mostly chill people. The worst type of crowds, by far, are the retarded whitetrash yobs described here. Because they get absolutely smashed out of their minds drunk and generally don't give a fuck. Music is more of a backdrop for them to which they can display their retardation.
Even here Oasis was one of the most rowdy gigs I've been to.