I enjoy pondering topics/posts such as this. I've always enjoyed this board and learned a great deal from several who have posted over the years so I actually think this board, relative to others is pretty "civil" and open about most things. That's literally why I find it the best wine board around! It's not my nature to be combative or argue aimlessly (especially involving things that are purely subjective and are at their heart about pure enjoyment anyways). If anything, I'm maybe more likely to not be more "persistent" about my views/tastes/opinions. However, I do feel that it is human nature to perhaps feel "protective" about one's views/tastes. There's probably several reasons why it happens. Hopefully, most of them aren't done with
intentionally gruff intent but out of "passion". Let's hope anyways

One possible reason that may be under all our noses is the simple fact that people, generally speaking, that enjoy internet forums/boards wouldn't (continually) participate in them if they weren't themselves either somewhat opinionated by nature or at least prone to enjoying (hopefully friendly and intelligent) discussion. That's why they log-in to such things to begin with. In theory, that's fun and healthy (I believe). Of course people can go too far. That's definitely not fun, healthy or considerate.
I know I always at least try to explain my views/ideas/thinking out of a "passion/romance" for what I personally like so that hopefully my biggest "fault" may just be that I come off as one-track minded (in perhaps a too optimistic, blinded or passionate sense). That I can at least live with.

For me its more about sharing what I love about wine (or which part of wine I love the most...). I'm aware that others aren't always into that part the same as me (or even care) but if you get one good sentence, thought, smile from what I babble then I'm happy and humbled. It's hopefully always about glasses always being half full not empty....
I think another reason some may appear to be overly defensive or sensitive about certain wine likes/beliefs they may have is due to the often "sacred" nature of wine history/places/practices that makes it all so fascinating. Unlike some other subjective things that people may also "argue" about, wine seems to instill notions in people that make them want to "protect" the world of winemaking and its enjoyment as a whole. Again, in theory this is maybe a defensive reaction with
good intent but of course some can get locked into thinking that they are the only "guardian" of wine's ideals as a whole, that they don't have an objective (or the only) license to be this wine guardian of truth/knowledge/respect.
Then of course there are the "bad" yet sometimes human reasons that people get defensive/snobby/argumentative such as simply ego, need to feel (or use) their knowledge to stand above/intimidate others, some may simply be argumentitive by nature, enjoy "stirring things up" and are good at it! But let's all hope we can ignore all of these, always be kind and considerate and just stick to those glasses always staying half full...

Take Care,
Jeff