Well, he should probably lose the glasses... but why is it 'masquerading' if he just wears normal clothes instead of The Suit?
Actually, it was a rather obscure reference to
Miracle Monday by Eliot Maggin.
In that novel, Clark is publicly revealed as Superman. In a conversation between Perry and Jimmy, Perry makes a comment to the effect that Clark is dead and gone and for Superman to try to go back to being Clark would be a sign of serious mental issues.
Of course, the L&C verse, the chances are probably better for Clark to be accepted
