i usually wave to anything motorcycleish. trikes, scooters mopeds whatever... if you dont wave back, no big deal. maybe you were using the clutch, or didnt see me or whatnot? ya know, sometimes i dont wave because i cant take my hand off the bars. sometimes i dont see ya.... whatever if they dont wave back because they dont like the brand of my bike, or because of cruiser/sportbike/whatever they dont wanna wave, then fuck em. its not important WHAT you ride, just THAT you ride IMO.