Even the ESRB, another example of gaming industry self-regulation, hasn't stopped gaming companies marketing M-rated games to kids or really slowed down sales or access to such games to underage players at all. If anything, they use the M rating as a direct marketing tool to kids: "your parents wouldn't want you to play this so you totally should".
EDIT: autocorrect is dumb
Sounds like the community of every competitive (or coop campaign) multiplayer game I've ever been in. I prefer just to not play online multiplayer, I don't have the time (or disposable income) to "git gud" enough to be able to even stand a chance against all the obsessed people who pour hundreds of hours into it in the first month and drive everyone else out.