I'm sad to see us already going in the, "Well, in my day, it was like this..." direction...
Isotropic is going to bring all kinds of players from many different cultures with all different mores and outlooks who are collectively much different than you. We can sit here and try to speculate on why this is, and write etiquette rules, etc., etc. but at the end of the day, you just can't let it bother you. (I work in a job where I deal every day with the Federal Government and the military. You want some serious, Grade A, first-class a-holes...?) I just go on, play, and if someone wants to be a dick, they'll be a dick. The only person who can get you bent out of shape is yourself. For the most part, my opponents' words don't change my record, and whatever they say has no bearing on what I'm really there for: to get better at Dominion.
Now, I'm NOT talking about things that affect the outcome. I know in team games, there's opportunities for kingmaking, and situations like asking your opponent not to boot you because you're at work and may get a call, they agree...and then they do it anyway (as I've had happen). I'm more talking about people getting offended when they don't get a "gg" or "gl" or "hf" or resorting to name calling/trash talking/stalling when the situation is hopeless.
"I've seen your games, you got lucky."
"There's a reason I'm 20 levels higher than you."
"Well, I guess I'll just wait for you to boot me so that way it looks like I got disconnected."
That's their problem. They failed, and they're making a miserable attempt at compensating. Hopefully, they can implement some form of ignore list, or come up with ways to discourage this type of behavior. But in the meantime, why waste the energy over the behavior of others (that doesn't matter) that we can't control?
For the record, when I enter a game, I simply say, "hi." I leave it up to them where things go next.
In a north american championship for MTG, an opponent literally spat at me, because I beat him on turn 1 with a combo deck. Literally spat on me. I've had opponents shuffle my deck and purposefully drop one card from my deck on the floor, then call a judge to report my deck for being under 60 cards.
In WoW online, I had one of my kids fall down 2 flights of stairs during a raid fight. I even had the curtosy of typing "emergency afk" before I left the keyboard. I was kicked from the guild for afk'ing on a boss fight, and called various insulting names.
Someone will die ONCE and some moron on your team will literally berrate him for 45 minutes calling him a retard non-stop. It's truly unbelievable to see people treating eachother the way they do on that game.
I'm very, very sorry to hear all this. I think part of the reason that you don't see this stuff on isotropic is because there's really no opportunity for it, and I think Dominion tends to attract a certain type of person who's fine with a game that doesn't involve the possibility of backstabbing, trading, or having your team let you down. There's some hardcore gamers I know who don't play Dominion because, well, you can't play like a dick and have it benefit you!