A little courtesy goes a long ways. You never know who might be the first one to drive/ride buy when it is you that needs help.
There are a lot of groups working against bikers, we don't need to fight between ourselves.
Agreed -- and so well said I quoted it a second time.
I wave at anyone on a motorcycle. Most return the wave and if some don't, so what? I wave at folks sitting in their yards, farmers in their fields, and kids out playing or riding bicycles. I stop to let people cross the street. I give a nod to cops on foot, on horseback or on a motorcycle. I once worked on a horse farm and learned that when you're on a motorcycle and come up on horses, slow waaaay down and go by as quietly as you can...no point spooking a huge animal with somebody up on its back.
If my left hand is doing something important, like countersteering or working the clutch, I don't wave and figure someone riding a bike who waved at me would understand when I couldn't wave back. I cut other riders similar slack.
I don't get the 1-finger-pointing-down wave that many of the cruiser guys seem to prefer, but whatever. Thinking one's self superior doesn't make it so.
A clearly nonscientific poll based on many years worth of data points has convinced me that people wave far less often in states without helmet laws, and in those states the worst offenders for not returning a wave are women
There...a lot of not really useful anecdotal information about Bones waving.