The only way I can make sense out of this is if the prof started complaining when the bagel came back with butter and cheese. Prof then likely threw a hissy fit and demanded it plain. Befuddled barista said "but you didn't tell me not to butter it up and schmere it ..." Prof then went all Henry Gates on her and started to lecture about the proper use of the English language. Maybe Obama can hold a coffee summit and bring peace to the nation.
Are the baristas at Starbucks really spreading stuff on your bagel for you?
I’m assuming they are handing out little plastic tubs.
Hence my original comment: take the free butter, put it in your purse, and get on with your life.