The Outsider said:
It made him sound like the "hey you kids get off my lawn" guy. Times change and technology allows for new styles. When Grunge came out 20 years ago, there were those that probably felt the same way about Grohl and other artists in that genre. You don't have to like dub step for example, or even understand it (which I don't). But have a little respect for those that are creating something that a certain segment does enjoy. For them, a computer is a musical instrument.
You missed the point of that speech. Music starts from the heart and soul. What an artist or band chooses to use as their tools is at their discretion. Dave also pointed out that there is still hope for rock bands who want to incorporate their own style that may not reflect today's standards. In the business, they call that throwback, I believe.
Also, grunge came the way after an oversatuation of 80s hair metal. Most people who were rock fans were tired of the style of music where image was more important than the music. When groups like Nirvana and Pearl Jam came abroad, it was a return to the sound of rock and roll without the need to put on make up and prance around a stage with lasers and fog lights. It was the version of punk, that anti-arena rock era where bands were tired of the stage acts and just wanted to rock.
BTW, Dave Grohl is fond of Shrillex. Did you also see the collaboration between FF and Deadmau5? No, it wasn't great, but it nullifies your quote of Dave sounding like the "get off my lawn" guy.