I'm guessing that is an internet-only kind of etiquette-- but I'd pay good money to see how that goes over in real life.
Nah that kind of stuff happens in RL all the time.
I have a friend who constantly bitches about stuff he either can't change, or just doesn't bother to change. A lot of us at this point stop him before he gets started but sometimes he finds someone new to start up with... Usually someone who is aware of his bitchfest history will break in and just say "Dude, seriously give it a rest."
I see the same type of things at work, when people are bitching about their workload, or management decisions or something. Eventually some people just start saying "ENOUGH ALREADY! Move on, or quit, or do whatever you plan to do about it, but stop annoying me with your constant complaining!"
People angry about a situation sometimes think that complaining about it all the time to random other people who don't have the power to change the situation will in some way shape or form help I guess.
What's worse is it tends to be ALL they focus on. Every time someone brings up any topic no matter how unrelated they find a way to bring things back to whatever it is they're angry about.
In reality it just really annoys the people who:
A. Don't agree with the complainers standpoint,
B. Don't really care that much, or
C. Might have cared, but don't feel EVERYTHING has to be related to the anger.
Maybe they feel that if they complain enough, it will get everyone upset enough to cause a change in some way? I don't know.
To each his own I guess, but I do tend to be in the "quit your bitchin and DO something about it if it really bothers you that much" camp.
(If all I wanted to do was talk about last nights episode of LOST, and you somehow found a way to work in your complaints about the new account that was added to your BoB, it's going to annoy the hell out of me...)