The Nostalgia Critic did an interesting set of videos that had what I felt to be a very good message. It seems like a lot of the time, fandom breaks down into simply just what people like or dislike with people very rarely thinking beyond the reasonings for those opinions. Which is fine really, no one's on trial here, it's just an opinion after all.
The problem occurs when people take these difference in opinions and treat them like fighting words. You see people fighting over some very subjective things where there's no obvious right and wrong and wonder "Hey, if that guy acts like that, I wonder if I do that sometimes too."
Anyway, the Nostalgia Critic's message is a very simple one of people have their difference in likes and dislikes and it doesn't really make them bad or whatever if they differ from one's own.