Welcome to the forum!
... years ago I tried a campground; once, and ended up leaving early for the reasons that you mentioned; now you say its gotten worse and I believe you!
I subsequently took up four wheeling and managed to leave so called "civilization" behind...Mostly...
I have heard that there are a few campgrounds that try to contain their clientele; they are relatively hard to find. Personally I go farther afield into a national forest and do remote primitive camping, only rarely with an extremely low noise generator, judiciously/intermittently used; only when needed. I would rather use solar but desert camping (Utah mostly) is way down on my list.
No reservations, no utilities, no hookups or public facilities (bring your own).
no neighbors (if you pick the right spots)... sometimes bears and other wildlife... especially after the weekenders leave.
Fewer partiers (because they need a pretty well set up four wheel drive just to get close)
Virtually no mobile homes, occasionally a modified pop-up, due to the unmaintained roads (difficult to get a 4wd vehicle into sometimes near impossible to get a 2 wheel drive or travel trailer in or out.
The off camber roads & trails make high center of gravity RVs and trailers a tip over hazard.. (I have actually seen drivers and passengers bail out).
The narrow snake like jeep trails rapidly.weed out fifth wheels, huge pickups and toy haulers.
The low hanging branches will forcefully remove air conditioners solar panels, roof vents etc...
The best campsites are precious; keep them secret, keep them pristine!
Edit; occasionally I like to group camp but NOT in campgrounds (often with folks that cannot reach the best spots); there is normally a wide selection of easy to get to (higher chances of noisy partiers) spots that most vehicles, many RVs and travel trailers can get to;
These can be suggested to folks and I usually try to get to them a couple of days before a weekend or stay several days after since the party type folks tend to be weekend campers, on holidays I regularly leave before the crowd get there or arrive after they leave..
Enjoy!