What is the badist scene in twilight?

If you mean worst scene in the direction of a fight then it is near the end of the novel when James and Edward fight in the dance studio, Edward is trying to save Bella from Jame's who is trying to kill her.

And if you mean the worst scene by pointless or boring? Well I don't think there is any really, but I think some may think that the parts where Stephanie Mayer write about Bella getting dressed, she does this a few times in the book and it may seem boring.