It's entirely situational. Each event is different.
I've done an insurance shoot where there was an LEO nearby before I started, working traffic near some construction. I walked over to him, and when he had a break in action, spoke with him...
I remain polite and address and acknowledge their concerns. If they are the chatty type I remind that the drone is in the air and it needs my attention. I also say I'm not staying long. I never engage in a conversation about law or FAA or who is...