In my opinion, this oral conflict between what band is which genre is pretty redundant. I say this because there's hundreds of genres and in my mind, half of them just seem pointless and as if they've just been made up. In my personal experiance, I've seen "Post-Grunge" tagged to one band, ever. You could say this about a lot of stuff, like trying to define between hard rock and metal and heavy metal and the like -just taking that as an easy example-.
When you say goth, as far as I can remember, Gothic is both a fashion sense and a way of defining a paticular style of architecture. There's some gothic writing too.
But this is excactly what I mean, it seems crazy to me to have so many genres to begin with. There should maybe 20 or 30 official genres in which anything that can't be put under a heading -which is unlikely if you have 30 genres- entitled "Alternative".
Punk has been around for ages though, Sex Pistols, emo is another fad which has begun to die out but again, has been around since the 80's, a note on that "genre" also, emo is a slang genre which derived from the groups of people who listened to a paticular band. Take MCR, they undertook the "Emo" genre when they realised that they could get groups of people to respect that and in turn make more money. Don't mean to be sterotypical but that's the way it's gone.
As I say, genres shouldn't cause conflictual debates, it's just another tag on the iTunes search box.