The cars are sweet... agreed. There is a high percentage of dlck-head drivers out there... perhaps the ones in BMW's and Mercedes' tend to attract your attention/reaction.
There are plenty of pleasant BMW drivers, you only seem to take notice to the snoby ones.
Take a deep breath, and notice all of the happy BMW drivers out on a sunday drive, enjoying the sunshine and their cars, not just the pricks. (sorry to sound like an idealist, but you get my point)