Why are you surprised?
There was this little school shooting thingy. Tarantino did not have a chance in hell.
that had absolutely nothing to do with it. Django still received 5 Oscar nominations including the most popular category in Best Picture. if the reason for not nominating him for best director was because of a school shooting, then they certainly wouldn't have nominated him for writing the script! lol
I think it just boiled down to the Academy bowing down to Foreign directors as usual by nominating Life of Pi and Amour in best directing when they should have been replaced with Affleck, Tarantino, or Paul Thomas Anderson.