As a 15 year old gamer, I find it irritating that my age group is so viciously stereotyped by the older generation of gamers - but I also find it irritating that most of it's true.
When playing online (more specifically, when playing online on a game like Call of Duty - which I do rarely due to frustration) it's a frequent occurrence to see a group of friends in this age group spouting whatever inanities they find amuses them at that point in their life. The most irritating part is that I am generally lumped into that group because of them - if I say my age prior to meeting someone, the chances are that they will automatically associate me with that group of people in terms of my gaming life.
It'd be idiocy to say it's not as bad on the PC side of things - while the gaming community in terms of people actually on the games are generally not as bad due to the higher expenditure required to gain entry into the elusive circle of PC gamers, "those" teenagers still are present and can still cause massive irritation when they start angrily smashing their keyboard in all caps.
The idea of an angry, racist, CoD-playing teen is a very real one indeed - I've witnessed many of them firsthand - but it's very, very annoying when someone else starts judging you because of the actions of people who you don't associate with and don't like.
In terms of the aforementioned CoD-playing teen, yeah. I dislike them a lot. I wish they'd stop shouting in those lobbies and I wish they'd stop with the racial slurs. But I also wish that even though they're shouting and because they're making those racial slurs I wouldn't have to deal with the bullshit that the older generation throws at me for being in their age group.