Either he is deying it to himself or he is trying to justify to customers why he, who earned well before, now has to work in a greasy spoon cafe and has to explain embarrassingly the different kind of toasties they serve and has to endure the almost humiliating customers aksing why their bacon roll has not yet been served.
So on the surface level the theme of the song could be either reality displacement or having to live with the consequences of not fitting in (or wanting to) with the absurdities of a "new regime".
And the melody going contrary to the tragic of the lyrics, which would be classic MK.