Like someone said; Stock trucks and H3's don't wave back. H1's and mods will wave back. I used to have custom paint, sold it, now I have a stock paint (but I plan on lifting it). Soccer moms don't appreciate what they have, and H3's don't have anything to appreciate
I was one of the first in this area to have an H2, now that they are more common I almost feel like anyone that waves at me must be a Hummer newbie. They are not near as rare as they once were. I don't initiate the wave anymore, but I always return it (except for H3's, unless they are modified:-).