Alle Menschen werden... Frauen???

In the aftermath of recent events in Cologne, the British media (or perhaps it was just the Guardian?) widely reported on the (now famous?) handwritten sign displayed during the protest demonstration, which allegedly said:

You shouldn't hit a woman, even with a flower.

See Guardian article here, for example. The front page article of the current Guardian Weekly (arrived today) repeats this 'slogan', accompanied by a photo of the aforementioned note – see below.

As you can (just about) see in the photo – shown clearer in the German newspaper article here, what the note actually says is this:

Man schlägt keine MENSCHEN! Auch nicht mit Blumen!

Have written to the Guardian to point out the obvious (and therefore somewhat mysterious) mistranslation...