All golf courses, the world over, have your idiots. The ones who talk a great game, laugh at others whilst standing proudly next to their full set of PXGs and proceed to shank it off the tee whilst looking at their playing partners and declaring, loudly, "it's been YEARS since I did that!", whilst the scuff marks on their clubs tell a different story.
Ignore them, enjoy the game and the learning experience. I marshalled the open this year and was with Rosey when he shanked a ball onto the next fairway. He laughed, at himself. It happens. Still the greatest game in the world, at all levels.