I live in an area where people will talk to you as you're walking by. In my experience, no, the median person is not Disturbed, obsessed with politics, belligerent or filming.

I do agree that the last point is true - but see OP's message. I don't want to talk to you in the grocery store. If I'm standing there with Earbuds in, and you make Smalltalk with me, don't be surprised if I totally blank you or seen confused.