I was speaking here just a few days ago about the unforeseen sociological implications of personal technology.
Just a few short years ago, if you wanted to take a picture, you had to buy a camera, purposefully bring it with you, and then go to get the negatives developed. If you wanted to make a phone call, you had to wait until you were at home, or use a pay phone. If you wanted to take a video, well, you get the picture.
Along with everyone suddenly having the ability to talk on the phone, take photos, or video at any and all times, comes the reality that virtually NO ONE has explored the implications of it.
Thus, it doesn't surprise me that some dolt would consider it no biggie to take a piture of your property in your home or garage. He's only been carrying the ability to do it for a few short years at the most, and before that, it wasn't an issue because it wasn't a possibility. He never needed to learn how to behave with a 24/7/365 camera.
Now you've schooled him. I hope he takes it to heart.