You're splitting hairs, which is fine. Tarantino's writing is famously gratuitous, whether it's profanity or racist language. And to like Tarantino is to have an appetite for that excess. The garage scene's use of the n-word is gratuitous and pointless, Tarantino uses it over and over again for cool shock effect as as someone whose parents aren't the same color, being married to a person of color doesn't give the white partner a license to say things other white people shouldn't/can't. Tarantino's fantasy is he's so cool he can drop the n-bomb. Jimmie is that fantasy. I don't even think the scene is a great example of 'ironic racism,' which is a whole other issue to debate.

As for Django, I think we're saying the same thing here? The use of the n-word in that movie is allowed because of the context.