This is a tricky one cuz it would need an admin with knowledge of the German language.
Happened yesterday on EU1. Paulus_HRE started flaming in chat in a very bad manner. I think it was after being teamhit by Jarlek. I am talking bad insults. After I advised him on his bad grammar in a... witty way WITHOUT insulting him, he started to insult me.
Not sure if this warrants a ban, that is not for me to decide, but at least (!) a warning is more than appropriate in my believe.