You are kidding, right? You surrendered to bratty behavior as "normal kid stuff" and let your bratty kids subject everyone on else around them to the same? Do you think they just learn manners by magic?
Only a few times did we have one adult take the misbehaving kids out of the restaurant while the other got the food wrapped to go and paid the check. Amazing how fast my kids learned that to go out and to eat in a restaurant, they must behave. They're now a pleasure to take out and we get lots of compliments on their manners. They're 7 by the way.
If I was unruly, I'd have to go sit in the car while my Mom and Dad (gee, a set) ate. I'd either return on better behavior, or they'd bring out my food when they were done having a peaceful meal. Did the same successfully with mine a time or two.