Firstly, this is not aimed at all cyclists - just the ones in my area !
Whenever I go out on a training ride, I can almost always predict the response I'll get from other cyclists I see, by what category they fall into.
MTB riders - all friendly, and will say hello or something similar.
Ordiary fitness cyclists (which I class myself as) - you know reasonable bike and functional kit - very friendly bunch.
Club cyclists - dressed in club or replica team kit and on very expensive bikes - you are lucky if they even give you a second glance - let alone speak.
They are obviously above speaking to somebody on a cheaper bike, or without the flash kit!!
Give me a runner any day - at least they all speak !