I was just going to say pretty much the same thing. If any one says any thing act all tooty snooty and be all like well im an faa registered drone pilot now buzz off or I'll have to report you for interfering with a registered pilot while in flight.
Or even better make a real nice print out of your registration and laminate it and put it on a neck lanyard then you become an authority figure to the stupid morons and sheep that studys show will do just about any thing that some one perceived as an authority figure tells them to do.. and all it takes to be an authority figure is any thing as simple as some uniform. or even the right shirt or even any laminated credentials or badge even if its all just gibberish and nothing on it.
and if some one really starts giving you a hard time still act all firm and start saying things like well I need to see some id to the person. lol and get all authoritative with them. and esp if they are the paranoid types which most people are. They should start feeling real uncomfortable when you start demanding to see some id and also maybe even there contact details so you can have some one from the faa get in touch with them about there interference with a pilot wile in flight and site safety and use the words, law and regulations a few times to and just be real matter of fact sounding about any bs you give them. lol Most dumbasses are just going to either comply and even if they think you are bluffing are not going to want to stick around to find out. Or they will just start being the ones that get nervis and be all like ok sorry to bother you and just leave.
IF you really want some fun also start acting like you are going to call some one on your cell phone about them and start having a conversation about what to do with the "civilian" lol thats interfering with you and your flight. and start asking the imaginary person on the phone what info they need you to get for the incident report. lol They will prob split before you ever turn around to look at them at that point. and it could be pretty fun screwing with some ones head like that.