Heh, I am old enough to remember when the first tape cassette Sony Walkman was released. It was officially declared as the End Of Society back then in the 80's because the dang teenagers would rather be bopping to their awful music than just sitting in silence with their hands folder in their laps, or listening politely to their elders and betters.
What a crock of crap that was then and this is now. Society is still here and going strong. If the teenagers in that Pool Hall didn't have their ears plugged up with their Ipods they'd be just be singing, yelling, laughing, chatting at each other instead, which I personally find way more distracting. Also consider that, whilst I understand that you want to concentrate on your game, the establishment probably gets far more revenue from teens on a night out, eating, drinking etc. that from a "serious" playing who may well just be sipping water all night.
And no, I don't expect kids out to play Pool socially to understand the etiquette of not standing in someone else's table space. Either the management of this establishment need to want to change the atmosphere to encourage more serious players, or you need to realistically change your expectations when you go there to play.
Sorry, I know it is tough for serious players to get the environment they want but it is also tough for any room to make a living these days.
