However the propaganda term "Hun" was actually the fault of Kaiser Wilhelm II, when, in a speech to German troops bound for China to intervene in "the Boxer Rebellion", he spoke of "die Deutschen, wie einst ihre Vorfahren, die Hunnen" - "the Germans like their forefathers, the Huns".
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Racial slurs are odd things. Call someone from Germany a Kraut and it's an insult, but in France "mon chou" is an endearment. "Picaninny" is seen as offensive, but "Bambino" is fine... Basically it should come down to the intention to offend, but then people will sometimes pretend they didn't mean to offend when in truth they did.