we dont really have fr on the trails i ride but there are people that ride xc race bike and people that ride trail/all mountian bikes. but there is never any tension between them. there is always a "whats up" or "how you doing" when i pass someone, that is unless one of us are going up and breathing really heavy and dont want to say anything.
i mean i ride xc and am going to race. but i watch nwd i follow mountain cross as well as xc racing. i love browsing through pictures of dh/freeriding. to me it is all mountain biking, some people just decide to ride differently