Yeah I didn't realize this for the longest time. I used to just think "He's a director known for making really good but violent movies".

But then I rewatched some of them recently, and you're right. Django is particularly bad. All Southern whites are depicted as completely soul-less, evil, conniving slave owners. Southern culture is just entirely smeared. Basterds, too, glorifies any violence against Nazis, like op said. The scene where they are trying to interrogate the German officer and bring out the "Bear Jew" for not betraying his comrades is just disgusting.