There are a lot of things to upset me on the golf course, but over the years, I'm happy to say I have learned to enjoy golf and let most things roll off my back. I used to be too serious.
Most in particular though, the biggest thing that ticks me off is... me...
I still have the golfing mind and knowledge that I developed many years ago that led me to being a scratch player into my early 50's. I know what I should do to make a ball do exactly what is needed to accomplish pretty much any shot I run into. When injuries made me take a few years off from the game, I've never been able to get my game back to what it once was. Life gets in the way...
Unfortunately, the mind and body don't communicate very well anymore and my body doesn't do what my mind visualizes. The upsetting part is, I don't often convince myself that the odds aren't good of making the shot Tiger would make, so I go ahead and try it anyway, and fail...
I upset me...
As far as outside things to upset me, there is one thing I have run into lately. Where I like to play, (Calusa Country Club in SW Miami), there is a group of about 6 people who always get two consecutive tee times. The first threesome tends to wait by the green they have just finished, watching the following threesome play. Since they are gambling, they want to see who is doing what. Then they are all together on each subsequent tee, watching each other tee off. It is slow play raised to an art form. Sometimes, once they are far enough out onto the course, they simply join up and play a 5-some or 6-some, holding up everyone behind them. For some reason that I can only guess is political, the rangers will never say anything to them.
One day we played a 6 hour round behind them. Another day we played ahead of them and they were 5 holes behind us when we finished.