Welcome back Taz, as you can see they still don't get your humour.
I get Tizaala's humour, but on this occasion I don't share it.
Of course there are idiots on bikes racing around the countryside, just as there are maniacal 4x4 drivers, idiot horse riders and destructive walkers and campers, but that doesn't mean that all of them are bad. In the clip, the rider's riding was fine and not open to criticism; what was prattish was setting up the prank.
I think it was filmed in France, and I don't know the status of their off road tracks.
The Government here is currently pushing through legislation to shut green lanes without consultation, en masse. Then none of us will be laughing, or enjoying our walks.