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Accepted AnswerStaffAdeOfflineHa. I believe it is just the code. It is something that each new Harley picks up and they won't acknowledge non Harley Davidson riders. There are obvously exceptions.
I find the same thing when I nod at motorbike riders when I am on my PCX scooter and they, more often than not, do not nod back.
I kinda want to shout at them "I do have a real bike too!"