One of the themes that Keith Kahn-Harris describes, that I've seen over and over again, is the criticism that metal is vulgar. This is an incredibly common criticism launched by the wealthy against almost anything working class. As far as I can tell, this is usually a way of delegitimizing anything that is direct, honest, and simple (think Mark Twain). I suspect this is the result of a defensive psychology built up in members of the upper class (especially their children), that protects their precious little egos and delusions of grandeur from truth. Not to sound like a liberal, but often the wealthiest of people are also the most delusional. They are given everything in life and so they build up giant egos and senses of entitlement. Combine this with being raised to believe they can do no wrong, and it's easy to see why they despise reality checks.