well I dunno about you guys, but where I live in the uptight and untrusting south east, mountain bikers ain't that friendly any more.
I have ridden the same trails for 20 years and there were not only a load more bikers out on my part of the South Downs all those years ago, but they were proportionately friendlier too.
And I have to say, maybe it's the lycra shorts or KOTM helmet, but when out on my mtb, roadies say hello back, and only the day before yesterday mtber's blatently blanked Mrs Wu and I saying hello to them as they passed.