I think the answer to the question broadly, and without singling out Burgundy champions in particular more than any other subset of wine enthusiasts, is that this is increasingly how people communicate in non face-to-face communications now – internet message boards, cable TV, talk radio, newspapers, etc. I think the main reasons, and they are often subconscious rather than conscious, are that:
(1) Polarizing, strident and/or extreme statements are most likely to get responses and reaction, both good and bad. Look at the most successful people in political talk – how many of them are careful, nuanced and evenhanded, as compared to bomb-throwers? Go to the message board page of a football team and start a thread saying “The offense coordinator sucks!! He is an idiot and should be fired immediately!! Everyone who backs this guy is a moron and probably lives in his mom’s basement.” You’ll get 5 pages of reaction. Then go under another name and post a careful comment about some of the things that the offensive coordinator did slightly better and not as good in the last game, and you’ll probably get 3 responses.
(2) Humans are tribal. By our nature, we tend to want to band together as a group in opposition to other groups. Go back to our roots as hunting and gathering tribes, and on forward into clans and fiefs and so forth, and now today into our fraternity/sorority, neighborhood, regional, sports fan, political and other “tribes.” This is how sports fandom really works. And I’m a big sports fan as partisan myself, with a closet full of burnt orange and a great disdain for Sooners and Aggies, so I’m not saying this in judgement or criticism of others, but I’m just trying to acknowledge what part of our human nature tends to make us that way.
Back to WB in particular, the Burgundy / AFWE point of view is clearly the board zeitgeist, and as a result, that group may stand out more than others here. Each internet message board has its certain zeitgeist at a given time, and those who are in the dominant point of view are probably the ones most often thought of in that community as being elitist, arrogant and intolerant.
Having said all of that, I think this board is terrific, and I think the positive to negative ratio as far as what I described above is very high as to most internet discussion groups that I’ve seen. The ratio of thoughtful and nuanced posts and threads to bomb-throwing ones is admirably high here, and the members do a pretty good job of policing troll behavior.
I hope that adds something to the discussion.