I had some chickens on my lawn the other day. Someone driving by stopped, started video recording me, my family, my neighbors, and the birds with their phone (I assume that's what he was doing, that's what it looked like) for a minute or two, then he drove off. He didn't say a word. He didn't respond when I waved. By my standards of social behavior that dude is a fucking creep and (years ago) I would have tried to go…
I'm a millennial and indeed, it seems perfectly normal to take pictures of things you want to remember later. Photographing a person without asking them is more questionable and I can imagine creepy ways to do it, but photographing a house seems 100% unobjectionable. I don't feel that I have any right to privacy when I'm in a public space, someone else taking a photo of me doesn't harm me in any way.