Marco I agree with you. There is just something that bothers me about that shirt or perhaps why a person would want to or have to feel they need to wear it in the first place. Throughout the years I have found that the safest thing to do is just smile and give them the spot. Of course I cannot help it if I have already caught all of the fish in that spot. I also cannot help the fact that my sense of balance means I must shuffle my feet while getting out of the water thus making some terrible big splashes, swooshes and all those annoying little things that spook fish.
It is all about stream side etiquette folks. No fishing spot is worth your safety or your life. These days folks are out there that would harm you if you fought them over the fishing spot.
An FAOL t-shirt would be really neat to have.
Rant over.