Coverage of the row on US news blog the Huffington Post generated 1,000 comments. The Economist weighed in with analysis, accusing Professor Rosenthal of a lack of decorum.
At Starbucks in Gloucester Road today, customer Will Tenney, 18, said the corporate language was an "inconvenience". But Joanna Symes, 40, from Wandsworth, said: "I've never been corrected on an order."