Very nice pics! Yes there is a time and a place and ...that place could be it for a quick photoshoot or quick vid of its sound (providing your not being an idiot lol) but probably best to do it when its completely empty. The guy should be looking at the circumstances (closeness of cars, if anyone was near, were you doing it in an open bit away from everyone at the back etc). Yes I don't see a problem someone 'advising' you of their displeasure but depending on how you did and what you did is also key. If I had blipped it just coming in and someone did that...they'd find me in their passenger seat and it would be a most uncomfortable chat for them lol Mind you, I do not like people not looking further ahead at the big picture so that annoys me in general....
Empty places mate are best is the key and don't be too much of a silly billy