To a sailor a generator is noisy, to a power boater a generator IS quite.
I am a crossover.. I have been a power boat guy for a long time and am only now moving to sailing. Yes, its true to power boat people a gen set is quiet and cheep. I tend to have a bit more respect than others of my former....
I have a small boat "29'" so there is little to no room for a real gen set but i did buy a Honda EU1000. which you have to damn near sit on to hear. I use it to charge batts and off it goes.
I enjoy the peace and quiet but i also know i sail in an area where is is some times 90 degrees at night in high humidity and if it was my wife or kids "if i had any" cooking then no one sleeps and i under stand a person running a gen at night.
You never know why people are doing what they are till you ask, hell they may not know " no night time gen sets".