Working for an online r/c retailer that deals with the general public rather than hobbyists I come across some unbelievable customers. Our most popular individual model is a kit version of a nitro buggy, but that's down to having a limited number of kits available and RTR models sell considerably more overall.
It does say something about the general public and r/c cars, they build a kit incorrectly, complain it doesn't work and return it expecting a full refund. When you point out that they can't get a full refund because the kit is built, and that the reason it doesn't work is because of the way they have put it together rather than a manufacturing fault, their first reaction more often is to attempt a card chargeback rather than admit they haven't a clue.
We had a RTR 1/5th buggy returned due to a 'manufacturing fault'. The customer supposedly knew what he was doing as he has had several r/c cars. He took the 1/5th scale to a car park, wiggled the steering as a radio check, put fuel in and pulled the pull start for the first time with it set down on the ground. As they hadn't checked if the throttle servo was working, and it turns out the servo plug had been loosened in transit, it headed off across the car park at speed only stopping when it hit a bench on the other side of the car park. Broken bumper, front suspension and a bent chassis. The fact that they were too stupid to start it first time with the wheels off the ground was irrelevant,
Then a ARTR jet aircraft was returned as 'faulty' because the servo control rods didn't go through any of the holes in the tiny 9g servo horns, and weren't happy when we suggested several ways to make the holes bigger. They had bought a ducted fan jet as their first foray into r/c aircraft.
Then we had a customer complaining because he couldn't start his RTR nitro truck after trying to get it going for 3 hours. It turns out buying a glow start when you buy your first nitro model is pretty useful.
I had to deal with one of the best today. I booked in an RTR truck, the reason they returned it for a full refund is that it is faulty. The reason it is faulty is that there was no way to turn off the nitro engine.

Reading the included manual or searching online would have helped, but no, they had to leave the engine running until it ran out of fuel as that it didn't have a way to switch it off.
These are modern customers, while we would think that if you started a new hobby there would be a period of learning and working things out, for most customers today used to modern gadgets they expect things to either work or be easy to learn enough to get going.