It would be nice if the attendants at Monarch Beach would enforce the separation so that the screaming, splashing children would be in one pool and the adults in another.
I noticed this when visiting friends at the Grand Wailea Resort on Maui recently, where they also have an Adults Only pool. I even overheard an irritated guest complaining to a pool attendant that they should do something, but the kid said they weren't allowed to do anything and asked the man if he wanted the manager to be called over.
Guess they don't want the pool attendants ticking off the inconsiderate and spoiled.
If it were me, I'd equip each Adult Pool Lounge with a Co2 BB pistol, and place a large sign right by the Adult Pool that says,
"Children Season!" 
But these are the same parents of the kids that kick the back of your seat on airplanes.
Most likely...yes.