You know just because you see someone using a film camera doesn't mean they want to sit there and talk with a complete stranger (and let's face it, usually an old fart) about cameras. Every now and then while I'm out shooting with my friends or family some old geezer will stop by and say "hey nice camera" (usually when I carry the Hasselblad). So I'll say "hey thanks, good day to you sir" and usually that's that. Sometimes a few more words will be exchanged and I might even let the person fondle the camera a bit or look down the finder which is usually followed by a very long "oooooohhhhh".
But sometimes someone will say "ohhh is that a 50/80/150/whatever lens on it" and I'll say "yeah..." and then they'll go on about some old story about how they had one or always wanted one or their friend who worked for Time magazine or whatever had one or this and that and you know what, I really do not care because I am out with my friends and my wife and the kids and whoever else and I just don't want to talk cameras, I just want to have a good time and use the camera rather than talk about it. So after ending up in this situation a few times I now just try to end the conversation as quickly as possible.
So maybe the 17 year old just didn't want to talk to some random guy so don't be too quick to judge. Just sayin'...