well said bostontrevor
My actually observations while riding are this:
*Of course prefaced by the fact I am making gross generalizations and that there are always exceptions to the rule*
full-kit roadies hate everyone especially if you are riding a fixie. I think there is a lot of jock-mentality going on there & they think that my track bike makes their double chainring 11-23 drivetrain look...small. they will not aknowledge you & will treat every mile like its the last 10k of Paris-Roubaix.
fixie-riders tend to be cool to everyone, except occasionally if your "ride" isn't "hardcore" enough you will get the sneer. I only get this in Urban riding & only after buying a pista. Poser!
mtn bikers tend to hate roadies because of the above & will be wary of you until you show that you are just a chill biker in which case you become another member of the brotherhood.
commuters love everyone!
As for the board: the fixie forum is definitely the best. we keep each other in check & call people out, but never in a totally mean way. and i don't see any of the other sections going on group rides.
jeff