Eh
Mostly every creature on this world have any kind of camera. From old people who digg it out from they old chest for shooting only family events, and 99,99% of mobile phone owners.
I really dont understand this phenomena about that, soo if I shooting some in public and if somebody comes to me me and moan something without reason I tell him to fckout in long tripple jump (like in some athletic discipline). If it is some kind of police creature sometimes I give him my ID and continue shooting and thats it. Some times I tell him if I am suspicious to him why he dont track me (in that way he will unknowingly protect you from creatures from first case).
As you see some times you must bee rude to protect you basic rights.