I use what suits me the best. TBH this is the first time I hear about class-warfare in software. "High-class" people can use Windows Server for all they want (if they define pricy as "high-class"), while the rest use what is the best for ourselves. Is Google going to abandon Ubuntu base as their main OS? Very unlikely as they can just strip out the package. Does Google give a damn about "class"? No!
Meh, I think that applies more to the consumer market than it does to the corporate market. If the corporate market were concerned only about branding, everyone would be using a Mac. And although there has been a trend in that direction, the overwhelming majority of corporate computers are running Windows to this day.
Your example is confusing, as Mac is branded as a consumer product: if a corporate market "were concerned only about branding" it would choose Windows, not Mac, as Windows is branded as an office workstation. The word "branding" in this context does not mean "trending", it means something closer to "typecasting".
Ubuntu is now low-class software, and high-class people use high-class software.