Seeing as the discussion has widened, may I add that working in the travel industry while back as I did, Brits were badly behaved abroad long before Boris was around. They were often drunk, rude, messy and loud. They had a reputation for flouting local culture. The Japanese were the best, being quiet and tidy. The Italians were the best dressed.
Anyway, the clip in the supermarket was nearly a minute and a half long, but the unpleasant words were not uttered. The Independent ascertains that someone said "Hi" to Boris, he acknowledged her with a smile, and the rest were Greek shoppers' voices.