It wasn’t that she refused to speak Starbucks language, it is that she called the server an A hole. She sounds like an elitist harpy who takes pleasure in ruining other lesser human beings’ days.
http://www.nypost.com/p/news/local/manhattan/venti_size_fury_A0uKw71Ky1UAOksmbjrBhI
Sounds as if an elite diva ran into a diva barista! Cat fight! I don’t see why she phrased it as having anything to do with proper language or grammar. She should just admit she was being a jerk. Bet she’s fun to be around!