Like many here, I try to be as polite as possible, but I'm relatively unimpressed by control freaks. If someone is interested in my drone and flight, I'll happily spend time with them and explain everything they want to know. If it's some control freak trying to exert authority, I'm under no obligation whatsoever to explain anything.
My first question would be, "And Sir or Madam, what authority do you have to hinder me in my flight?" Unless they show me a badge or FAA credential, they can take a hike!