+1!! I agree - BMW owners seem to be in aggregate much bigger jerks than Porsche owners, ...although YMMV, as in all things. There is no shortage of German-sports-car-owing pricks, and they cover all the marques.
My own experience in the Porsche Club of America has been pretty much prickless, though. They are for the most part all nice people without any I'm-better-than-you attitude... just a bunch of gearheads, and that's the level they interact on,a dn they don't differentiate between members that go for the newest and highest-performance models and those (like me) that dig the older classics. One member can be a million-dollar-salary CEO and the next one a blue-color machinist, but the difference never comes into play... they are all about the cars.