I live in a three year old fifth wheel in one of those "snobby" RV parks, have for over three years. The couple who own it work their tails off to make and keep it nice for all residents. There are currently three older RVs here. Their owners do not maintain their rigs and have piles of stuff outside. Their sewer hoses (one held together with duct tape) and water lines have leaked on more than one occasion due to aging out. The piles of things outside provide nice homes for rats and mice and other varmints who migrate to other units nearby. One lady very kindly left food out for the feral cats. Great gesture, except the cats were spraying and pooping under other people's rigs and on their chairs etc outside. The owners are too nice to ask these long termers to leave.
There are five other parks within 10 miles of here. The rest are trashed and their rents are higher. The waiting list here is long. By keeping this place nice, it will always be full. This is their business and how they earn their living. They do reserve judgement until seeing the rigs. They use the 10 year rule to limit their exposure to problems. There are a few 15-20 year old rigs here that are well maintained, no problems.
I traveled all 49 North American US states in my well-maintained self built ten year old van and stayed in a few RV parks along the way. Never was I refused. My little van was parked next to huge Motorhomes and fivers. It was sorta funny. I was ALWAYS treated with respect. I have most frequently been parked on public lands with other mostly self built vans, trucks, cars, many older with their share of battle scars. Only then did a few people act with disregard for others, loud music, pets running loose and messing up my gear, drunks walking very close by with their foul language and reckless behavior.
I am readying my new-to-me Class B to get back out there and will shut down the fiver for the next six months or so. I will probably stay in a few "snobby" parks along the way but mostly public spaces. No matter what, it is my choice where to camp. I choose to avoid those that can cause problems for me and my rig. It isn't the age of the rig or its owner that's the problem. It's the way it's kept. It doesn't take money to stay clean and tidy.