Silly love songs is quite clearly a retort to the press and even JL who berated Paul for writing soppy silly love songs, it's not meant to be a 'love song' per se but him saying and what's wrong with silly love songs, you'd think people would have had enough of silly love songs but he looks around and sees it isn't so - probably means there's plenty in the pop charts and that he still churns them out and the albums get sold. My opinion on it anyway.