You may legally carry a firearm while on a hunting or fishing trip in Washington state. I would suggest that you get a concealed weapons license if you choose to do so, it will prevent any action against you if you are in your vehicle, etc... Having said that, I would never suggest pulling or pointing a firearm at another human unless you are ready and willing to pull the trigger(think about it).
I cannot believe the etiquette out there. I don't want to point fingers at gear fisherman, but they are almost always the ones that tromp up and start plunking right below me when I am fishing a hole or slot. Can you not see that I am flyfishing and need a little room to operate, can you not wait until I move through a spot?!
I agree that this site is a great forum to discuss issues, and perhaps some of the newbies will learn some etiquette. It takes a village to raise a fisherman!