Its seems about 1 in a 1000 you will run into someone who will say "don't leave that crap here", "whatever yer sellin jist keep movin", or something like that. Just wish them a nice day and move along. 9 years and 50,000+ flyers I was never threatened. I don't enter gated front lawns. Wandering dogs are a bigger problem than people, pepper spray is a good idea in case you run into a mean one.. Never had to use my though.
Most people are friendly and if you wear a uniform it makes a big difference.
If you want people to notice your faults, start giving advice.