I already experienced some crazy people about the drone noise problem...
But all the time, it was the same: the guys or women just come on me and ask if that flying drone is mine (no, I have a RC in my hands, and I'm looking for something in the sky , just for fun...) so I told them that YES, I'm flying a drone... At this point, they litteraly injure me saying "that they came at this place to enjoy silence and nature , that it's incredible to see drones over here, that I certainly not have any rights to fly in the area, and I should just go away... .... ...." while they are screaming on me I make my mavic Come back, land and switch it off, and then I gently tell them that now, all people around (or animals) just only hear them screaming on me, and that it very much noisy than my mavic 200ft away....
Generaly, they look at me with anger , and just shut up and go away....
BUT I also found a good way to make people understand what drones are all about , and involve them , by asking to people present in the area I'll fly , if I can fly my drone around, and if it'll not disturb them, saying that it's a little bit loudy and that I'm.sorry about that... Most of time, they just tell me that it's OK , and Come to me when I take off the drone to see how does the place looks like from above. Then a conversation grows up about drones, generaly people are interrested about it. And most of time, they give me their email adress and ask me to send them the video.
I think the noise is not necessary a problem, the big problem is that most drone owners just fly anywhere anyhow ... So I can understand people who are scaryed about drones...
But , to compare, a drone at 100ft is less noisy than an tourism airplane at 1mile, or than an helicopter 2 miles away... Or than a liner 20000ft above pour heads... Many things that may disturb people , but they don't care about that , maybe because airplanes are in the air since a century now, and people know they dont have to worry about now, knowing it's "danger-free"..
Here is my point of view, and I think there is no need to make drone noise a big deal... Exept, maybe, for some applications, where you need a silent flight...