Simply hasn't been my experience. Usually I just get ignored once I say I've never done the dungeon but a few times it's been, "Well, come on over." then I arrive at the dungeon only to find that I've been replaced in the meantime.
You're suggesting I ignore the raid leaders? That's what I did by not going on any more of their raids. Now they're bitching that they can't fill said raids. Perhaps mmo's aren't for big ego'd *******s who can't handle the consequences of their behavior.