Tobar said:
Thorin's hate for Elves
This is a necessary consequence of the film being made after Tolkein wrote LOTR and after Jackson made his films. The dwarf/elf relationship is clearly one of animosity, whereas he may not have had that all figured out as much when he wrote The Hobbit. These new films are very much an adaptation of the book, in the context of the previous films, and this is one area where it shows.