Interesting thread and although I was initally reluctant to "throw my 2 cents in", I agree that the OP was not condemning all parents.
The statement was interpreted by some as such (ahem, Saintfanfl) but there is a legitimacy to the desire for adults traveling without children to want to enjoy their resorts and have quieter atmosphere.
We are 'empty-nesters" with one son moved out after college, other finishing in VA.
To us, it does seem impossible to avoid kids around the pools, adjacent rooms, etc. but it helps to avoid peak family travel periods like summer months of July and August and school vacation weeks (varies).
An example for us was a few years ago at Marriott Lakeshore Reserve (Orlando) in late May. We thought that would be a reasonably quiet few days to visit, prior to Memorial Day week.
There were several families staying there and we situated ourselves in a quieter spot, around the other side of the lazy river, opposite the slide and zero entry area of the pool.
Eventually, more families spread throughout the pool area and a young boy (maybe 5 yrs. old) and his older brother showed up with what appeared to be grandparents. The young boy was miserable, cried and complained the whole time. Nothing seemed to appease the kid.
That's not really enjoyable for other guests and certainly the harried parents.
So why keep the unruly child poolside and continue to disrupt the area?
And adult pools are abused as we witnessed at Newport Coast back in 2011. A Mom showed up with two kids at the adults pool and they brazenly used the pool and hot tub! We have seen that at other timeshare resorts, including non-Marriott, over the years. Aruba Surf Club keeps a security guard posted at its adults pool so it less of a problem there.
Basically, it can be difficult for adults looking for a little "kid-lite" timeshare vacation as these resorts by their intended design, i.e., two or more bedrooms, eat-in kitchens, multiple pools and recreation amenities, etc. to accommodate and attract families to them.
Seems best we can do is to roll the dice for shoulder seasons and hope for lower volume (literally)