Is it true that SAS guys would purposely pick fights with random people in pubs in order to....?

The Special air Squadron are not thugs they are highly trained professional soldiers who work behind enemy lines where anonimity is paramount they dont put themselves in a position where they may bring attention to themselves. If they were involved in a bar brawl there is the possibility they would be picked up by the police and end up in court. Not very anonymous is it? These men rely on stealth to survive and to them violent open action is an absolute last resort to save their own lives. They know what they can do they have no need to prove themselves to anyone.