If this was the age of Gamecube or before, Xbox games not included, I would agree with you. However, in this day and age we have this thing called Online Multiplayer. And the most annoying thing about online multiplayer is, you guessed it, annoying whiny 13 year old brats. You may think you aren't one now. But in about 4-5 years, you'll be playing with the 9 year olds of today and be sorry for those that you subjected to grinding ear-rappage with your pre-pubescent voice and sense of humour.
That's my only problem with this. You may say you won't play online, or only with friends. But inevitably you'll end up in the main servers. Inevitably, someone will say something that you disagree with and you will speak. And once a child in your age group speaks, it does not stop.
So remember: You won't destroy your own sanity; you'll destroy someone else's.