Everyone to their own taste,said the Cow, as she licked her tail.
For over 55 years we have stayed in our RV's in Truck Stops, Rest Areas, shopping centers, Wal-Mart, employee parking lots, private, commercial, Corps of Engineers, State, County and City Park camp grounds, etc. We have always used our generator(s) when we had a generator and when we needed it. That's what the Generator is for.
I can't remember ever, even once, when we had a problem with noise, with our without the generator running. Yes, trucks run their Reefer Engines, truck engines, and APU's at truck stops and rest areas. Railroads run trains past many Campgrounds. Highways have vehicles running past Rest areas. Camp Grounds have rigs entering and leaving. All make noise. Long ago we must have learned to sleep through it all.