This is my first time dealing with an unfortunate situation like this. Now I have experienced first hand how much some people despise drones. I realize not everyone feel this way but its sad how many people have negative impression about this technology. They seem to think its sole purpose is to invade their privacy. I will put this behind me once and for all but just had to share my experience to let drone pilots know to please be cognizant of people close to your drone or yourself. I was at Dillon Beach (north of San Francisco) yesterday spending a lovely Sunday afternoon with my family. This beach is not in any NFZ and is the reason why I chose this location to visit. This area is immediately north of Point Reyes National Sea Shore which is a protected area in a NFZ. I'm well aware of this and had no intention to cross that boundary. When we got to the beach there was a couple and a man close to where we parked. There is no one else there but us. After I took my P3P out of the case and set it on the ground, they immediately took notice and the man asked me how long it can hover. Of course I answered all his questions and he was impressed. The couple let me know they saw whales and pointed where they saw it. After I completed my pre checks, I launched and uploaded my Litchi mission. Another flawless mission and I was happy. As it was on its way back, a family arrived and immediately took notice of the RC in my hands. They knew I was controlling something and asked if they could watch my iPAD. They were in awe of what they were seeing. 300' in the air with the waves crashing on the beach. Once they saw it coming back and hovering above they were so amazed. Now the situation is about to get ugly. A car with 4 adults parked close by as I continued to take pictures and vids of my family on the beach. The 4 adults and a dog got out of the car and they proceeded to walk on the beach. I didn't pay any more attention to them as I was busy piloting. My wife and sister in law were sitting on a log and I wanted to get them in the shot and do a fly backwards and up maneuver. As I was setting up the shot about 15' from the ground, I noticed the old lady from the newly arrived group walking towards the drone. Then out of no where she threw a bottle up narrowly missing it. I couldn't believe what I was seeing. Of course my instinct is to take it up higher where she can't do any harm to it. So that's what I did. Then she proceeded to throw the bottle at it again, lost her balance, and fell on the sand. As she was getting up, she was screaming and said" You #@$!%^, people come to the beach to have peace and quiet and you bring your toy here to invade our privacy!" I explained to her I was taking pics only of my family. Then she said, "No! I saw you taking a picture of me!" At this point I knew she was nuts and all I can do is explain to her I was not taking her pic. I even explained the area is not in any NFZ. But of course at that point she couldn't care less much less understand what a NFZ is. I even offered to land it just to keep her at peace. By this time, she started walking towards me and I was prepared for anything. Then my wife and sister in law started arguing with her while all of a sudden she just proceeded to get in her car. I kept the bird at 30' as I am not taking any chance with her running out of the car and causing damage if I landed it. The other 3 men walked back to their car and asked what happened. I was ready for anything especially to protect my family. At the same time, I was trying to figure out where to land in case it gets really ugly. But we just explained what happened and they got in their car and left. I remember my brother asked if he had his phone/camera pointed at the beach with her in the background, would she throw something at him? It was not until later that I put 2 and 2 together. She must've thought we were not all together and I was randomly taking picture of people on the beach. When I hovered and pointed the camera at my wife, that's when she's had it and saw a chance to get even. She saw my wife yelling at her and that's when she probably knew we were all together and she made a mistake. That's why she just got in her car and stayed there. Oh well, at least it ended with no casualties. I would say it was a very interesting day. So again, please be careful what kind of people are around you. There are people out there who will stop at nothing so their voice is heard. Ok, water under the bridge.