As a fully fledged member of the plebian 156 owning fraternity and a lifelong Alfa owner (suds, guilietta, 33....you name it) I do object to your generalisations.
Been on a 3 week tour of the British isles in my sportwagon (old, scruffy and not in any sense flash) and I make these observations:
wavers: several - in the main they are male, over 35 and driving either very sporty models or pre-2000 ones.
non-wavers - all women (notably blondes) all 147 drivers and anyone who looks like their car was provided by the company. And everyone under 35.
So I now select carefully before raising my hand........!