I feel for Mark on this one. It was one small child and a dittzy parent ruining the mood. Very common these days. It seems he was doing a mellow listening thing on the accordian and changing gears to do the Chicken Dance for one out of control kid is a little too much. You can only bend so far.
The last party I did the parents couldn't care less about what I was doing during dinner ( you can't always be the center of attention for a 4 hr. party. ) I did switch gears and played top 40 dance music for their out of control kids who were running in circles, wrestling, screaming, etc. Sometimes parents want you to be the baby sitter and I refuse to do that.
Later I got some of the parents to my end of the room for some dancing and did get some compliments for my playing during dinner so you never know. You just gotta go with the flow, and sometimes its annoying.
Good for the AD, some people need to be educated in proper manners.