I did see one sign out on the course that said "we object to our roads being closed" (or words to that effect) tied to a wheelie bin about three quarters of the way round the course, plus there have been reports since that some of the locals are complaining about the amount of litter being dropped, mainly plastic bottles (which is understandable) - although I'll say that most of the bottles I saw at the roadside were not one-use water bottles, but proper cycling ones that I'm guessing had been fumbled when riders were trying to get them out of cages (or weren't in there properly originally, given the amount I saw at the bottom of one particular hill).
I think the main reason though is that the route mainly goes through countryside and farmland - very few towns and villages are directly affected by the route, so there's less people to complain compared to RideLondon etc.
Having said that, I'm not too keen on giving any praise to the organisers given how badly they cocked up on the water/food front! Previous years went really smoothly, so I can't explain how they got it so wrong this year.