Most of those that don't wave in return are just close to being blind and don't see you. I remember in my younger days, I would be driving and meet my sister coming the other way and wave to her and she would NEVER wave back. I used to wonder what she was P-Oed about. Well later on I learned she was having sight issues and just could never see the person in the on coming vehicle. More then likely in TV that is a much bigger issue. People can't see or hear as well as they used to. So they avoid conversation, don't return waves and seem to be more isolated. So it's not a friendliness issue, it's a aging issue.
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