The "show" has evolved to the point where the actions and behaviour portrayed are being emulated either directly or subconciously to the extent that they're being carried over to driving on the roads or public places.

Very low numbers of real-life Doctors would be watching Doc Martin so similar emulation would be either unlikely or unlikely to continue without censure.

On the other hand, the majority of Top Gear viewers are drivers with the ability to access vehicles, roads and public places. The attitude being demonstrated on TG is such that it's time for more responsible demonstrations of vehicles and driving because very few viewers have access to an airfield to horse around like TG does.

It's clear that Clarkson has carried over an unpleasant attitude from the "show" in to real-life and if he can't now control that it's time he drove off to pastures new where the doorways can be widened to accommodate his grossly overgrown ego.