I get it all the time... i'm considered a "younger" driver for one of these fine f30's and i either get the look from people that think:
A: this is daddy's car
B: get the nastiest looks for no reason
i dont do anything at all to provoke any of these people but like other members here said, haters will hate.
That said, i've had the occasional comments from my boss on how he wish he could drive a BMW (the guy is way richer than me) but other than that nothing too nasty.
I did have one of my older colleagues tell me that i should've have gotten this car as i should've "worked" my way up to this type of car, didn't know what to say to that but i imagined he was just jealous