I was a;ways told "If you don't have something positive or constructive to say, Keep your mouth shut!"
In Poker there are times when you can say one thing and your opponent take's it to mean something else, Once I sincerely said "good luck" to an opponent who moved all-in with Pocket Rockets, I called with Snowmen (8/8) and he thought I was being Sarcastic, but in all honesty I read the situation as an all-in shove or fold from him and he did exactly what I expected, so I called, I had more chips than he had, and as we were close to the bubble, I expected nothing less.
My 8/8 made trips and I beat him, but at the end of the day it was a simple coin flip, and I was not frightened to double him up if I lost,
Poker is a language all of it's own, we all understand the rules, and playing on-line there are no arguments about the outcome of a hand, as the computer decides on the value of the winning hand.
So talking to other players via the keyboard is the only way to communicate, some talk can be misunderstood, especially when punctuation matters in a sentence, but in general I find that players who do take the time to type messages, are usually in the same frame of mind that Poker is a Fun game, and winning or losing a game, really does not matter that much.
It is all about how you play, and how much Pleasure you get from the game.
When the fun Stops, STOP!