A much-told story about the late great Paul Foot goes something like this:

He was choosing some oranges to buy at his local street market when he noticed the Outspan label. (Quite correctly) full of righteous indignation about apartheid, he declared roundly,

“I’m not buying these! They’re from South Africa!”

“Quite right, sir,” said the stallholder. “All those nasty black hands touching them!”