There are already a handful of teenage asshole driving BMW. In fact there are a lot of assholes who drive BMW. Price point and income dont change who you are. It's who the person is and BMW seems to attract asshole drivers.
Personally, I believe 135i will bring more mature drivers to BMW. Most posters on 1addict are less involved with image and appearance. They are more interested on buying a more track suited vehicle or a better valued BMW, 128i. This will change of course when 1 series gain popularity.