i ride on the road a fair bit and when i do i often don't feel like saying hi to everyone i pass, i'm in my own world cos i like riding alone sometimes. sorry if i've offended anyone locally!! but i don't get why would you feel offended if i don't know you? maybe some see it as simple courtesy but i'd say that's more about offering help to riders at the side of the road etc, it's different. i always do it and i always appreciate being asked.
agree with TJ, i'm more likely to say hi to older walkers, either as pr and/or just cos i like cheery walkers )