Some people take the game very seriously and get pissy whenever they don't do well. Then they start to try to blame their lack of success on anything they possibly can such as people making too much noise, the lane workers being in their field of vision, drops of sweat on the wood on the approach, someone else using their ball... dumb things like that. I find it really immature and when I do shit, I just admit that I had a shit day. It happens to everyone just like those days of yours where it seems as though you have never played disc golf before. Hell, even the pros have days where they absolutely suck and cannot really explain why.
I rarely do as well on competition days as I do on practice days. I guess even though I am normally cool as a cucumber the pressure must get to me a little bit.
I can totally understand the idea of not doing as well on competition days. I used to do a team sport where I would kick but during practice, but come competition I would always play more conservative so that I just seemed middle of the road. It's too bad I couldn't have shaken that. If I am doing bad at something, I take full blame for it. I know I'm not the best, so why blame others.