I think the main problem here is the adults acted like children just as the children were allowed to behave like rude brats.

It doesn't matter what the occasion, children should not be allowed to behave as though a restaurant were their own private playground and adults should be able to handle a situation where food is delayed or other mishaps come up.

But the good thing that as long as people like the OP boycott a place because they aren't able to act like grownups, the more real grownups will have places to go with some peace and quiet while they are dining.