A couple things in regards to Dacil:
it's called taking the initiative to get into PUGs and talk to people who know how to cap...effort! i know! crazy!
1) Terminology is not commonly known- There isn't a magical pill, that when swallowed, ingrains all legions technique and terminology in the brain, the two are learned through in-game and out-of-game experiences. That means the existence of Pugs is not known by everybody.
Also, Pugs are NOT a good source of learning for newer players. A new player if picked (what are the chances of new players frequently being picked in Pugs?) will most likely endure the hardest gaming experience of their life. Being put up against players who have played the game for countless months, they will probably just be target practice for the entire map, learning nothing.
i've been in, where there was a llamaer and they were not called out on it (edit), so if they dont care to find out then llama = how to not learn b/c if they keep doing it, they're clearly not learning....that is all
2)
Never yell at new players. As Shade said, when a new player joins a game they do not know what is right or wrong, hence being NEW PLAYERS, they just do what they think is fun, since thats the reason we play video games right? To have fun. What authority do you have to mandate what they're allowed to do?
Put yourself in their shoes, imagine you've been playing for a week now and your skiing is getting better, not like anything you've seen the pros do, but better. You get to the flag-stand grab the flag and start heading back home, feeling accomplished in the sense that you're finally contributing to your team. However, you look down and see in chat "Y WOULD U LLAMA THE FLAG?!?! WTF NOOB U SUCK." Not only does this make you feel terrible, it makes you not want to play the game filled with these jerk-offs.
So no, don't yell at new players for not knowing what to do, instead try helping them, rather than complaining on the forums and being a sarcastic nitwit. Crazy right?!