Alcheng -
even in my area I get the same kinda reactions! It's weak to think people are to up tight to even give a simple wave/thumbs up/peace sign what ever you want to do!
All this year I was thinking the same thing until this past weekend I saw an older (older then me sorry if offending you) guy in a 40th, right on the first main street turning out of my neighbourhood and he was only the second person in my area this year to actually beat me to the wave and give me one! Most times I do it and get a late reaction from drivers if any! This gave me a little hope that there was actually people who still want to be part of the Z community!