difficult question. but in the case of the IF and O forums, i think it's just because "they" are big and "we" are small. they don't need to defend their music in other forums as their own is so fat that they can't even manage to read all "their" threads. on the contrary, users of small forums usually accept influences from the outside more openly (my personal view). so if we let one user of each fraction face each other, maybe the one of the big forum never bothered about other's opinions and doesn't really want to argue about tastes. but this seems to be essential for small-sized-forum-users, because they always have to introduce and / or defend "their" band towards others. but the "big" one doesn't want to hear all this, beacuse it doesn't matter for him/her. he /she has his/her mind set and no one will change it. maybe he/she even has no idea who dt is, actually, and what music they play.
so in the end big one would say about small one
"he's so fucken argumentative, i don't wanna hear all this, in fact he's biased all the way, and i don't need this." (sure he is, as is everyone using a band forum).
other way round, the small would say about big:
"he's so fucken ignorant, doesn't even hear what i say, asshole."
just a guess. but the others are always worse
