What Johnny isn't clever enough to work out is that Morrissey's political views over the years have been largely based around working class beliefs, not the stereotypical left vs right. On likely just this one particular point, Farage appeals to Morrissey and a swath of working class people due to him opposing mass immigration. That's really it and Johnny is smuggly playing this pseudo "Morrissey is a racist" card for all it's worth.
Johnny has an unpleasent side to him that's revealed itself from time to time over the years and his obnoxious son, see mentions of his bad behaviour from a Newcastle based recording studio, belies this fact to an extent. Not settling with Joe Moss for the cost of a PA until the Smiths had ended, giving Andy a solitary afternoon in his studio after settling his royalties claim, resulting in Andy saying at the time that Morrissey had done more for him. Most of all for me, it's the snideness over the years towards Morrissey who has stayed relatively silent aside from the open letter.