German is not even a real language. It’s a fake language.
(Satirising Trump's claim of fake news.)
Looking at the history of the German language we see that the country was divided into individual states – without a collective force to standardise the language. (But the assumption is that there was a common unstandardised language.)
Looking at the history of the Dutch language we see in its origins – around the 2nd Century AD – there was a common link to the Germanic and Franklish languages spoken at the 3rd century, before it arose as a distinct language (Old Dutch) in the 6th Century AD.
If anything, it seems that German has a slightly better claim to being a real language than Dutch. I don’t understand why the Dutch would make this joke.
It feels like a in-joke I’m missing.
My question is: Why would Dutch people (jokingly) claim that their language has a better historical claim over German?