Hey...those HD guys aren't waving at you...they're drawing your attention to the asphalt where parts that keep falling off their bikes might have landed in your lane.
It's quite courteous of them. Unusual, but courteous.
And I always Always ALWAYS wave at the ZX-14 dudes (there aren't that many of them, after all) while deep inside my helmet, I'm going...neener neener neener, ha ha ha, and loooOOOooooser!
Edit: I accidentally waived at a scooter dude the other day.
It's quite courteous of them. Unusual, but courteous.
And I always Always ALWAYS wave at the ZX-14 dudes (there aren't that many of them, after all) while deep inside my helmet, I'm going...neener neener neener, ha ha ha, and loooOOOooooser!
Edit: I accidentally waived at a scooter dude the other day.