Ed it's not about the people. It's about what people are use to. It's about what may offend someone that doesn't offend another.
Craig the rules change. It's a very good idea to make sure the rules are known before playing, naturally.
The "dirty pool" is a very difficult thing to determine in the sense of being right or wrong.
For instance..."snooker" is a position that one can be in by mistake or intentionally by the opponent. It is part of the game and not "illegal". The problem is that one that is a very good player and finds him/her self in a position that they can't make a shot can intentionally place the cue ball in such a position that the opponent can't either.
Even though that is a "legal" play depending on who you are playing one may want to consider if it is a smart thing to do. It may be they think it is not a legal play and that you are just a dirty player. I grew up playing with it best be an "accident" if you left the opponent snookered. Even then it didn't prevent certain players from going ballistic...right or wrong-intentionally or not.
Some take the game very serious and sometimes it's easy to get in a game that "little things" like that aren't so little.
As for me...once I got use to it being common and exceptable with the on-line version it became a move that opponents wish I didn't know.
"Blasting the balls" and hoping that luck is on your side...man I've seen that cause problems you just don't want to see. That's another thing they do on-line that could get you a trip to the hospital when and where I grew up...of course if you were new they'd give you a notice not to be doing that unless you were breaking. Players know what I'm talking about and that I'm not talking about a "breakout shot".
Anyway...just knowing how serious the game can be to some and realizing the "culture" could cause issues - in real life...it's nice to have the space between the players. LOL.
I don't play on-line games and this is really my first and it's just something I noticed that's kind of strange to me.