It is never acceptable to cheat in anything in life, but as far as pool goes many times a match, whether it is a league match or a tournament, is played without a referee present. So, in a scenario where there isn't a referee present, the ONLY two people that should be able to call a foul during that match is the shooter and the non-shooter.
Now I ask you, do you really want/expect the non-shooter to be walking around the table behind you/beside you, hunkering down next to you to insure that you don't move a ball or commit some type of cueing foul?
I don't think so.
Maniac (thinks a non-shooting participant SHOULD be sitting as still as possible and as quietly as possible in his/her chair)
Some people in this thread have made statements insinuate that if someone was to NOT call of foul on one self while playing them, that they would not tollerate it, they would quit playing with them, maybe demand their money if they are gambling cause the opponent was "Cheating".
So would these same people excommunicate their friend for blowing a stop sign but not turning themselves in? Or would they stop talking to a friend who came home from work late because he had some drinks with colleagues, but lied to his wife and said he had to work late?
These are things that happen everyday, and are very similar in action, but yet no one bats an eye at these...