I don't think it's him giving up. I see it more as he is finally accepting his limits. He is not the same golfer after injuring himself. He can start working on a game/swing he can use. I look at Furyk and can see that he knows his limits and plays it, and he remains competitive. If Woods can find that zone where he is comfortable and hurt-free, we might see a few more wins.
I didn't play real well last week in Pinehurst, but I took a few photos at MidPines, one of my favorite courses in the area. First, the view down the first fairway:
An inviting drive down the hill, but then uphill to a deep contoured green.
Next, the green at the par-5 10th hole. A small green, very well protected.
That little gap into the green is a steep false front, pretty common at this course.
Third, the 15th, another par-5.
Seemingly easy, after a good drive you'll be hitting this shot from a downhill, right-to-left slope.. If you hit the draw that seems natural off that lie, the ball is ending up left of the green, unless you've aimed into the trees on the right and carried the bunker on that side. Notice the severe false front, and the long roll-off to the left of the green. Last, the 18th:
One of my favorite finishes in golf. This terrace has the best 19th hole view in the Pinehurst area.
That sounds miserable, I know it's easy to go to the dark side in golf, so easy to become bitter during a round, but I expect veterans to know how to overcome, it's part of learning, it's an advanced golf mind that can take the punches during a round and stay in the good place mentally, because that's the only way to get your game going again, and maybe even more important- stop from bringing the entire group down, because we all know that one dark player can affect everyone's game.
As for the etiquette stuff, he's just incorrect but I would have ignored him with a smile and a sure.
As others have already mentioned, you have to factor in the type of person that has the drive to even get to that level in the first place. They aren't like us.
In a similar, but different ;), vein; at my office we build houses for really, really, rich people and occasionally have one of them complaining over a fee we're charging. My first thought is always something like "you are building a 10 million dollar house - what the heck do you care about $400?!?!" And then I'm reminded that it's entirely possible, even likely, that that thrifty, penny pinching, attitude is likely part of the reason he's able to build such a nice house. That's who he is and perhaps that's even how he got rich.
Same with Rory and the rest. That's who they are. You don't get to that level by accident and it's doubtful that you get to that level just for the money either.