Yeah, what Oleg said.
If they are under 6-5, the restaurant should either ban them, or have a special section separated by walls.
Edit: Really, I'm a kid myself[13], and It would be some bullstuff if they banned all minors, but yeah, kids under 6-5 should really be banned or kicked out if they act up. Its loving annoying trying to eat my food, and having this kid in the distance yelling to their mom or just flat out screaming.