Have to say I have noticed nearly everyone in anything vaguely quick (or frequently less than quick) seems to want a race when I drive my Z4.
I've not had that happen since I had a Capri 2.8 Injection 25 years ago!
On my way to work it is most entertaining when they try to attach their Scenic/Zafira/Discovery/similar POS to my back bumper just as the NSL dual carriageway starts to curve...........