Last year I had someone at the aerodrome where I fly come up to my Mavic Pro and start handling it. I got rude and told him hands off. Nobody in any model airplane club lets strangers handle their planes or drones. He got rude to me back, and I felt I had to call the police. They chatted with him and he is no problem anymore.
Last week I was filming with my Sony X3000 camera rig on the Oregon Coast. A man walks up to me, while my camera is rolling (red lights on) and mounted on a tri-pod, he steps in front of it, pushes his finger on my lens and says, "Is that the lens"?
My response was, "you're asking me, where your finger is, if that's the lens?" and then I smile and say, "Really?"
He got it and walked away. I will probably block someone from touching my equipment going forward. I just can't risk the cost of them damaging my cameras.