It's ok. This kid is just an arrogant musician. ALL musicians suffer from a "holier than thou" attitude. ALL. No matter what. I'm the exact same way. I just know that I do, and I'm not a prick about it. Yeah musicians understand music differently, but that doesn't mean you have to be such a fuckin cock about it.
As ATN so eloquently put, if you were really such a musician, you would love music, not just guitar rock. No one cares what you have or have not listened to, and let me tell you kid, if you're braggin about listening to Dragonforce, you may want to re-consider your entire life.
Every single person on this site who is going to read this knows music well. They are not all musicans either, but they will put up a good if not better argument then these previous two.
So don't tell us not to argue because you've been playing guitar your whole life, especially when you give us a link to a shitty band like that. That band is exactly what you're complaining about in music. Douche.