The worst fishing related for me is when people keep a fish they have snagged. I mean out salmon fishing in Alaska its really about snagging the salmon IN the mouth and all, but anywhere else i can't stand to see someone keeping a fish they didn't really catch.
Non-fishing related, CAN NOT stand repeating myself to people. You know those days on the phone with mom and you assume she is listening but after you get done explaining how you pulled in the 80 lb halibut she out of nowhere says sorry i wasn't listening. Grinds my gears. >