Also on the mental toughness thing, it's not that hard to distract a golf player and break his concentration. We have seen this from many players including Tiger.
Doesn't that reinforce just how difficult golf is? It is an accepted standard that there should be as close to complete silence whilst a golfer takes his swing due to the mental concentration required to complete an effective stroke. Golf is a hugely mental game. Every
professional golfer is sensitive to distractions from unruly fans.