I've recently attended a concert that I don't like (and believe most weren't too thrilled about it either), but after the last movement ends, everyone just clapped and not a single person boo'ed. [It was like the orchestra didn't even bother for rehearsals]
What do you do if you're attending an outrageous performance? Do you polite clap at the end? Boo? Or clap in the middle of the performance?