is a German idiom which means
„Ruhig Brauner! Brich nicht den Frieden! - Quiet, Brownie! break not the peace, now.“
Even without knowing the origin of the idiom, it was always clear to me that the origin was something that is said to a horse like in this video:
My understanding of using it in online forums has always been mild ironic mockery (at most), but I noticed that it is more and more often seen as an insult. Often from people who don't know or don't understand the idiom and who think Brauner is referring to a Nazi (so calling them a Nazi or "besorgten Bürger" this way). Or maybe because no one has ever calmed down online when he was told "calm down".
So is "Ruhig Brauner!" an innocent idiom or is it an insult? Is there a difference in online/offline conversations?