I do agree, the theatre is a community. Everyone respects each other (or ignores each other), though generally pitch in and help each other out.
However, it cannot be denied that some theatre people (not just actors) ARE bitches and will be rude, offensive, and confrontational. I would say one person in every other show I worked on came across this way. Granted, I have only been in the business for 8 years.
In regards to the message boards - my advice is just deal with it. Deal with the attitudes and the amusing posts and the younger population of posters. This is an ONLINE community. Several opinions in a field where opinion rules. Our opinions discussed here are judging the opinions that designers, directors, and actors use to create their art. So of course, there will be controversial ideas and opinions.
If there is ANYTHING that could improve on this board is the REPEAT POSTS! My goodness, I remember when I believe it was John Raitt passed away, there were six posts announcing his death ON THE FIRST PAGE ALONE! Before you post, look at the first page! Do a search! Don't clog the boards! Don't be a server space whore!
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle