‘Theatre still has a sheen of respectability, so people feel they can behave badly because where they are cancels out how dreadful they are being,” says John, who has been a box office manager for 15 years. From my early 20s to my mid-30s, I too worked in the box office, at some of London’s top theatres. During my decade in the job, I witnessed audience behaviour ranging from the odd and the outrageous to the outright belligerent. If you are under any illusion that theatre audiences are classy, allow my former colleagues to disabuse you of that notion.The misuse...