It's not so much the 13 year olds I object too - it's the damn cheaters!! I mean what is the point in playing an online FPS if you are going to cheat?? Where is the skill in that? (Though I guess a lot of the cheats are 13 year olds <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> )
Most embarrasing multi-player fps moment for me was losing to a bunch of 13 year olds at counter strike at a big LAN party... they were good sports though so I couldn't hold a grudge!