Some might say that the rot set in with superstar footballers, quaffing Cristal between their sexual escapades. Others might go back further, and point to city traders swigging from their ostentatious magnums of whatever’s most expensive. In any case, it’s now clear that the downward social movement of champagne has now reached something of a nadir: it’s now the tipple of choice for allegedly violent provincial teenagers.
I’m annoyed when global corporations can’t be bothered to spend a small amount of effort localising their products for the non-US market (Microsoft and Apple are both guilty of this) but, that kind of cynical indolence aside, I don’t see the influx of American pronunciations and usages into the British dialect as a bad thing per se. In fact, I find it fascinating to observe the evolution of language in progress.