I'm not sure how HD owners know from a distance I'm NOT riding a Harley, I would say the majority of the guys that don't hold up the infamous wave to fellow bikers, are HD guys. I try tent to hold up my hand as part of the tradition, but some how I feel like I get punched in the gut when I get blown off. Its much easier to notice a HD coming at you because you can hear them, I know some guys just don't get into the wave thing anyway.
I wonder how this whole wave thing started anyway? LOL
Sport bikers are the ones who wave the least here. Touring (Harley and Metrics) generally wave. Bad Ass on Harley or metric often do not wave, but that is understandable.
Sorry you live in a place where you ignored by other bikers riding Harley's. Just more of them may be one reason. Also, many are limited riders, meaning that owning the bike is enough, riding it somewhere is not a regular experience.
The wave, like the Jeep wave, the Bugeye Sprite wave was originally when there were fewer of anything. A Willy's would wave to a CJ, a Sprite to Triumph or even an Alpine, any motorcycle to any other motorcycle, regardless of brand. Then the baby boomers grew up and proliferated the highways, but many brought the old time "Hey I am glad to see you share my passion" wave with them. Once waved to, other felt that they could also say, "Hey, great to see you riding".
With so many bikes on the roads on sunny weekends, I who enjoy waving will get tired of it. After 987 waves, a smile, nod, or ignore. Not that I am not glad to see them riding, just I don't think they need my acknowledgement any longer as they have also probably waved to at least 987 other motorcycles before we passed.
Anyway, that is my story and if you push it, I'll change it.