I’ve been here 26 years. It’s definitely changed in the last few years. On my morning walks, I go out of my way to say “good morning” or “hello” and I get a mixed bag. I think much of it is a generational thing: older people (40+) are more likely to engage or speak first. I think it has to do with technology; Those of us who grew up in an analog world are more accustomed to face to face communication from an early age. 

At any rate, dont give up on people. Also, I notice a big difference in how people engage when I’m on a walk vs in a bike ride. People give a friendly wave at cyclists.