I would say that Hip Hop, or even Classical/Operatic music is the most misunderstood music. Hip Hop transformed from something special, to a corporate farce, and very few people these days knows shit about classical/opera. If they do, they learned it in music classes, or are listening to it to be snobs, while there are a minute amount who heard it, liked it and explored it. Heavy metal, death metal and all that has a huge fan base, and everywhere outside of America has gotten over it being the "music of the devil" or responsible for anything evil. So I'd say that statement is flawed. You're perfectly entitled to like whatever music you want obviously.
Do you 'get' extreme metal?
I get all music. Do I own "extreme metal"? Well I own Slayer, Carcass, and Bathory, but it gets more extreme than that. By your definition, yes I do, but I listen to a far greater range of music than that, and I can't say it's my favourite genre. I say that, while In Flames is playing on my computer :s
Are you a fan? Are you indifferent? or does it make want to scream 'ARGH TURN IT OFF!'?
I like it, I think it has an unrivaled energy, and works very well live. I find a lot of the fans to be cunts though. Not all, but a lot of them seem small minded, and have got into the genre as some sort of "oneupmanship" to prove they are more hardcore than their friends or the people at their school. Most will be loving indie music and pop by their mid 20's. I've seen it happen.
If you are a fan, tell us why and how it makes you feel to throw on some good old blast beats and death growls
Like I said, it's got energy. Some, like In Flames, are sing along song-able, while some are the perfect way to get energised before a night out, or to exercise to. Each genre of music has it's place