Well sometimes, there may be an acceptability.

We have a special needs daughter. We do not have close family living nearby and we wouldn't trust many people to look after her properly.

In order for my wife to go along as well, we have to take out daughter. We know that if we didn't let her play her DS, she would want to go home. She does not make a noise and sits at the back quietly. Sometimes, that is the only way the 2 of us can get out.

However, if it is grown up people, then there is no excuse and should not be tolerated.