You talk as if these was reserved for kids. In fact when a child is loud, cries, or otherwise makes a scene there are usually some quick fixes food, engage in a discussion or play, or nap time.

What gets me is the adults who act like kids, can't be supervised by anyone, have a sense of entiltlement that greatly exceeds anything do them or others.

Can we keep them from spoiling my PC experience?

I always let people know I am in a public place when making the kinds of call the OP mentioned. Basically making them aware I am out here in the jungle so a heads up anything can happen!