I have had little brothers of friends who played in high school who were whiny and had to have their way.

I have had know-it-alls who thought they had the best ideas and would argue rules, specifics of a scenario, or get off topic all the time.

There have also been those who chewed up pencils and leaned back in chairs and broke them.

It runs the whole spectrum. I have had different individuals in my experience who each have had a couple of the traits and thankfully none with all of them.

Game Masters of any RPG who do not explain the scenario and proceed as if everyone gets what the point of the play period is.

I remember we took turns having different people in Science Fiction Club in high school show us their favorite game. The guy who showed us Traveler with all of its different rule books did not have a well balanced scenario and people were dying without any understanding of why. The GM had read the rules and quickly explained them. We got the idea behind RPGs, but we did not understand key points about how Traveler was different. That was over 30 years ago, and I don’t remember specifics other than we were not happy with the experience and only tried Traveler a couple of times. My brother, Robert and I came up with our own science fiction RPG with simple rules and we played that until Star Frontiers came out with all it’s detail and simple mechanics.