If it's going to be that bad, then why go?
My missus and I have different tastes in a few things, she likes opera for example but I really don't. So I don't go to the opera with her. Simple. She doesn't come to gigs with me if she doesn't like the band. Simple.
She has a condition called M.E so finds it pretty hard to do things like that on her own and gets a lot of anxiety because of it so appreciates having my there knowing i'll sort things out/help her if she needs it.
Like @Basher i actually like the film and if it was just a showing at a cinema it'd be find. The issue is the singalong element! We're going to the Christmas markets before hand so i'll have to load up on mulled wine!