Based on the most Dad-joke reading possible of the first two lines of the Wham! song “Last Christmas”, Paul Feig’s slight rom-com wears its genre clichés on its sleeve and uses copious fairy lights and tinsel to distract from its threadbare plot.

Kate (Emilia Clarke) is a cynical, self-destructive Christmas shop worker, estranged from her family and rapidly running out of friends to exploit for a…