Sure.

But this is certainly not any German specific rule. Have you never seen these wonderful US court room thrillers about the white anglo saxon Georgian reporting the murder commited by an afro american?

The insulted in your case is a witness and the relevant question is, whether or not e judge follows a witness statement or not. Simply a normal court room situation. Reporting somebody to the the police without reason is a criminal offence too, so the report (and the witness statement under oath) has some relevance.