but my reputation dropped from 47 to 0 within two days. :)

Because you were not only insulting them but are also very derogatory and slandering about them right now.
Furthermore, your "argumentation skills" are rather... lacking... as it can be seen in your comment section.

Even if they are racist in tendency and mostly write nonsensical nice things about flowers and photographs.

They are not the racist here.
You're being the racist here, proclaiming that a "German Race" exists.
The person in question was criticizing you and said that there is (biologically) no "German Race".

Satirical criticism is not allowed with sentient beeing with big steempower.

It is. They did not flag you for your views, but how you responded to criticism with insults and now start a smearing campaign against them.