There are reports of rioting at the opera in Leipzig--see here. I will definitely have to look into this. It's been almost a century since anyone has reported this. It would appear that German audiences have limits after all.
According to various sources there was rioting at the opera:
25 August 1830, at the Théâtre Royal de la Monnaie in Brussels, an uprising followed a performance of Daniel Auber's La Muette de Portici.
September 10, 1838, in Paris at a performance of Berlioz's Benvenuto Cellini with Gilbert Duprez in the title-role.
May 30 1913, in Paris, the premier performance, by the Ballets Russes, of Igor Stravinsky's Rite of Spring.
"To my knowledge, there hasn't been a significant classical music riot since 1973, when New Yorkers inside the beautiful Carnegie Hall booed so loudly at the US premier of Steve Reich's Four Organs that conductor Michael Tilson Thomas had to abandon the performance halfway through." See here Stretching the definition.
I think I was referring to the Ballets Russes riot. I haven't witnessed any riots at the opera.