I can not agree with the adage of "most of Opeth's fanbase" is on this message board. Not everyone thinks internet forums are all that cool, remember...we are the geeks that like Opeth, but not the majority of Opeth's fanbase.
Most normal people would probably dismiss most of the silliness and bitching that goes on a typical message board as "lame," "boring," "stupid," or a "waste of time." Same goes for alot of metal fans, who would probably add "gay" and/or "un-metal, dude!"