I have been actually fairly lucky with theater audiences and manners. I run in to far more problems at the movie theater or, more commonly, at concerts.
My worst experience was in the Mezzanine at The Lion King. I paid more at the time for that ticket than any prior Broadway show. I went with family, including kids. At the end of Act I, we were all so bored including the kids that we were debating whether we should leave at intermission. Decided to stay for Act II to see if it got better, which was a mistake. We kept our kids quiet and in their seats, but the couple next to us had three young children, who were equally bored and starting to show it. I was tolerant at first, but then their kids left their seats, started whining and making noise, and the Mom started having playful discussions with them in a voice like she was in her living room. And she kept acting like she could not hear the shushes from the other patrons. One of the kids got down on the floor and Mom started saying in a loud playful voice "Who's Mommy's little treasure? Does Mommy's little treasure want to play a game?" Mommy's Little Treasure (who looked about 8 and old enough not to be on the floor) starts crawling down the aisle under everyone's chairs, making everyone have to move their feet so as not to step on him. Instead of the mother making him get up off the floor and take his seat, she starts saying "OH, he does. He does want to play a game!" I finally could not take it any more and fixed her with my most malevolent glare and asked "Are you serious? For the price of these tickets, do you really think this behavior is appropriate or safe for your child?" She literally stared at me in stunned silence for a full minute before she finally called the child back to his seat - which meant half the row again had to lift their feet so he could crawl back. To this day, Mom and Her Little Treasure probably think I was being unreasonable. Any time I am slated to see a kid-friendly show, that experience comes to mind, but nothing even close to it has ever happened again. From the other Disney shows to Chitty Chitty Bang Bang to Matilda, the kids have been amazingly well behaved.
On a side note, the texting thing needs to be nipped in the bud though. I am really weary of these people coming to the theater and never looking up from the palm of their hand because they have such "important" things to say. I went to a matinee of A Gentleman's Guide to Love and Murder. A middle-aged woman across the aisle from me was deep into texting - then the lights went down and she took no notice. The chorus comes out and begins the first number, she ignores them completely and keeps right on texting. An usher finally arrived at her seat and demanded she turn it off, which she most reluctantly does. Intermission hits and immediately the texting starts again and the same scene plays out after the lights go out and Act II starts. Same usher shows up a minute later and says "I told you about that before" and again she reluctantly puts it away. Very glad there was a diligent usher on hand, but what the heck was so important that she would spend the kind of money that theater tickets cost and ignore the show right from the start so she could text?
Updated On: 2/4/15 at 03:29 PM