[novok]

A drone whine is high(er) pitched, so it doesn't go through closed windows and doors nearly as much, and the noise is a relatively short range and not supersonic like a helicopter rotor. Diesel truck rumble is low pitched and pretty much goes through everything, closed or not.

[OnlineGladiator]

And the human perception of higher pitched noises is that they're much more noticeable and much more obnoxious. And when the kid across the street is flying his drone, I can hear it in my living room through my double-paned window. I'd much rather hear the FedEx truck idling than that fucking thing whizzing around - and it's hundreds of feet away!