Much worse than the fact of a banana milkshake being chucked over Nigel Farage is the inevitable discourse it has occasioned. This has mostly involved progressives finding it very funny and others trying desperately, and unsuccessfully, to reason with them. This is as good a time as any to reiterate a point I hope to drive home to all those who belong to a rival political tradition to progressivism, be they right-wingers, liberals, social democrats or Marxists.