[agere_contra]

Calling the Germans ‘the Hun’ was common currency. For instance: Churchill did, most people in Britain did.

Completely unexceptional amongst the Anglophone Allies.

[Verginius Rufus]

It gets worse. During WWI, the French called the Germans "the Boche" and some Americans followed suit. Nobody knows what "Boche" means but it's clearly pretty bad.

I think the Germans were the ones who started the Hun thing, using the label of themselves. Of course they have no biological relationship to the ancient Huns (other than that some Germanic tribes in the fifth century were subjects of the Huns).