I ride solo out in the country and have rarely had the very occasional male bike rider warn me that he is passing me or acknowledge me with so much as a glance if going in the other direction. Now farmers and truck drivers in any direction are another story- trucks passing will hannd back a bit, give a toot to let me know they are there and then pass with plenty of room.

Since I can ride for hours without seeing another living soul, it makes it a bit less lonely when they toot and wave but I would think the same would apply to male bike riders. As far as women riders, out in the country, I have yet to see one.

It probably is probably regional though.
marni