This may have to do with the troubled history of alcohol in the US. You've had the temperance movement which lead to Prohibition, which was too extreme. After its repeal, the temperance movement faded somewhat, until automobiles became more common and you have MADD pressuring states to raise the drinking age to 21, which is now effective in all the states. That has inadvertently contributed to an extremely unhealthy culture of binge drinking on college campuses all across the US. That early experience with binge drinking may partially explain the lack of healthy drinking culture in the US.

However, anecdotally "I'm driving" is now pretty much the best reason to give and not to be pressured into drinking. But that's just been my personal experience.