The "Baywatch" actor had a huge hit in Germany when the wall fell, but rumors he thinks he reunited Berlin get him angry.
Until 1994, male homosexuality remained a crime under West German law.
The European offshoot of Lollapalooza is set to take place in the park on September 10 and 11.
Threats follow suspected arson attack on property set aside for asylum-seekers.
Hans Modrow, East Germany's last communist leader, is still angry 25 years on as he recounts the chaos of his country's collapse