In retrospect it's fairly typical behaviour for less literate types to adopt a word that sounds sophisticated beyond their standard repertoire , and assume it's sufficiently cromulent for formal use. (A very recent thread on HN was around the use of the word 'decimate' as an alternative spelling for 'destroy', for similar reasons.)
I think Boris Johnson is a profoundly bad force in the universe, but I do recall feeling the editing of one of his appearances on a UK TV show (Have I Got News For You) was patently unfair, as he was asserting that calling small four wheeled vehicles 'quad-bikes' was etymologically unsound. His point (I imagine - the broadcast did not include the justification) was that 'bike' is a corruption of bicycle, in turn rooted from 'bi', referring to the two wheels.