Precisely.

"I would like to help you in your endeavours, but I'm afraid I have a prior agreement with X. So you're fucked."

With a capital F.

I think the worse press-etiquette is no communication at all. that drives me nuts!

I've just found out that this situation is quite rude :
Let's say I'm Turkey, Austria asks my help against whatever, and I just finalize my orders without even an answer.

"I would like to help you in your endeavours, but I'm afraid I have a prior agreement with X. So you're fucked."

I don't think that one is so bad. At least you know where you stand.

The most disappointing press in when the other play says "hey let's make black sea (or wherever) a DMZ" and then promptly moves there.

You believed that? Ouch.

1) People being rude
2) People being silent

3) People being people

3b) People being people pretending they don't know the other people in the game although they're all sharing the same bedsit/computer.

I HATE it when people are silent.

Silence never lies. If someone ignores me I always try to get everyone else against them as they will undoubtedly come for me.

"I like this pairing better, sorry".
A prejudice from the beginning- that's not diplomatic.

"Lets ally vs X"

And thats it, its like "durp" you told my neighbor the same thing.

"And thats it, its like "durp" you told my neighbor the same thing." But maybe the neighbour didn't respond yet. ;)

"You stabbed me in a different game, so I'm just playing to make sure you lose."

or

"If you don't make {extremely foolhardly and disadvantageous move which offers you no benefit and the other person a great deal}, we're at war"

Haha, good ones.

"Well, at least I beat you." when he is about to die in a year anyways because he decided to attack me.

I was playing a live game recently as Italy and the Austria player was just being stupid.

Me: Sat 08 PM Spring, 1902: Ok moving to Ion. I hope we can maintain a DMZ of Tyrolia. I understand you have a working alliance with Turkey, but sooner or later on of the two of you must give - Turkey needs to move past you in order to expand.
Sat 08 PM Spring, 1902: Since I haven't heard from you, I will be forced to move to Tyr preemptively. If you reply I can reverse the move.

Him: Sat 08 PM Spring, 1902: retreat from tyrolia immediately

Me: Sat 08 PM Spring, 1902: Moving to Boh. Lepanto.
Sat 08 PM Spring, 1902: Just saying, even a basic amount of press would be appreciated.

Him: Sat 08 PM Autumn, 1902: betrayal is not pretty
[Note, I have not 'betrayed him' in the least.]

Me: Sat 08 PM Autumn, 1902: Are you agreeable with the Lepanto?
Sat 08 PM Autumn, 1902: neither is noncommunication, my friend. If you dont communicate, i take it you mean to stab
Sat 08 PM Autumn, 1902: I AM MOVING TO BOH. IF YOU COULD COMMUNICATE I WOULD BE ABLE TO ALLY BETTER WITH YOU.
Two points IM trying to get across and dont know if you can understand.

Him: Sat 08 PM Autumn, 1902: i have communicated. you are a liar and a rat.

Me: Sat 09 PM Autumn, 1903: Uh oh. Look where that got you.

Him: Sat 09 PM Autumn, 1903: rot in hell liar
Me: Sat 09 PM Autumn, 1903: Aww look at the poor baby it's crying. Go on, run to mommy dear.

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Point of story - if someone doesn't communicate, they have no right to accuse you of all sorts of imagined 'betrayals'