German here. This is 99% sure fake news. German police is only able to even touch kids at that age to take them back to their parents. Kids up to 14 are executively immune from the law. The source is also kind of iffy. The right to protest is also enshrined in German law. As long as they are not violent they can protest all day long.

Berlin police have confirmed that a 13-year-old was detained “on suspicion of insult,” which is a criminal offence under German law.

Dawg…