I wave to everyone, regardless. Even scooters. I usually get a wave back rom HD's but whenever I don't it is an HD. That's when they get the old "Bronx One Fingered Salute" from behnd. It's just a matter of respect for someone else on two wheels. It says, "I know man, it's farkin' aweome! I feel you." If you can't give me that back, well then stick it up your poorly tuned tailpipe! You obviously don't get it.