personally, quakecon is a kiddy daycare (and nightcare) for a ton of immature preteens who are annoying not just in games, but also running around hyped up on Bawls and MtDew, screaming and yelling and starting "WHOOOP!" cries.
Now i'm a serious gamer and i dont mind having fun. laughing, etc, but when fun turns to annoyance, it kinda ruins the gaming experience. This is why I love 21+ LAN parties. Drinks can be involved and the gaming is more laid back and relaxing without these annoying kiddies.