Every time I drive by and wave at my neighbors, they act like I’m not even alive or they are ignoring me! Why are they so snooty?
Well, there is a simple explanation. They can't see you in your car. With all the windowing tinting now days, most people just can’t see into your car because it appears very dark. Yes, even thought it is midday and the sun is shining brightly, they still can’t see you. When they are in their car and you recognize their car, they still can’t always see who is waving at them from inside your car.
Stop or open the window and give them a friendly greeting. I believe you’ll find that they really want to greet you and keep up your friendly relationship.