Yebbut.... I was riding a bike near the top of a far off mountain, miles from civilisation. I passed several dog walkers, hikers, mountain bikers, motor cyclists, and even CAR DRIVERS and we acknowledged each others presence with a wave , nod, or a quick "hello". Fellow human beings just acknowledging each others presence. I also came across a few roadies.... They made more effort to ignore me than it would have taken to give a small acknowledgement in a similar way that other members of the human race had done. Weirdos..
OK, so the above scenario is mostly fictitious but not far from the truth IME... I wouldn't be expecting any acknowledgement in an area where cyclists are concentrated, e.g. London. But rural locations? Come on.... It's only good manners, IMHO., particularly if someone has made the effort to be friendly and you then decide to blank them!
This is what I mean. Thank you.