Previous BMW owner here...
And I really hate that stereotype. ******** drive all sorts of cars, not just BMWs. Hell, once when I was driving in my E38, some dude in a brand-new F-150 just randomly hit his brakes like this guy did, switched lanes, and slowed down. As soon as I was getting ahead of him, he started keeping up with me, rolled down his window and started calling me an a-hole for tailgating...