My area is a huge cycling mecca it seems like, and I'm still just a newbie/novice but I've probably put in 300-350 miles since starting up and I can only recall one greeting from a fellow cyclist (he also was riding a vintage bike) and we only head nodded since we were hauling ass in opposite directions down old redwood highway. I've only had one non cyclist greeting and it was a local cop (he seemed to be drooling on my Le Mans). I wouldn't call cyclists unfriendly, but the guys in kits sure don't say hi to anyone, and the rest of them seem to avoid others on bikes because of the guys in kits. (I could be wrong)