I understand the concept of a question of a hierarchy (!) but can't imagine that either driver in question would think they are 'above' the other. Both models in question are theoretically equal IMO.

I can't imagine any BMW car driver waving in my area, unless it was an early 2002 or 3.0 coupe. Waving meant acknowledging a common bond, and simply buying a car that they sell 1000s of can't forge that bond.

I do understand waving, it was common when I rode bikes (not Harleys, they were above it all...), it was common with the Saab 99, and it was very common with the Morgan +4.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue