FWIW People used to wave to one enother just if they owned an import. I remember getting waves from S13s, Celica GT4's etc and then having them follow me to have a chat about who imported it, what you've done to it etc...
Then the import scene grew big enough for its own seperate Skyline enthusiast scene.
Now thanks to the hard work of the enthusiasts the Skyline can be owned by practically anyone, parts are available everywhere, there is alot of knowledge of the car. You dont have to be an enthusiast to own one, and they're practically everywhere. Its only normal that people who are less appreciative of the car will own them and be less interested in the scene.