BMWs are nothing special in So Cal. A dime a dozen – look around next time you’re out and you’ll see so many you’d think they are a Corolla or something.
I really think drivers react much more to how you specifically are driving than the type of car you drive.
You could drive a (Ferrari/Audi/BMW/Vette/Viper/Rolls) aggressively and you’ll get anger from the drivers around you. Drive it slow and carefully and people aren’t gonna give you a second thought.