I don't understand texting during a show at all. You don't spend 25-300 dollars to text someone. If you're bored. DEAL!Experiance life! You do not need to be entertained all the time.
My father is addicted to his blackberry, and whenever my family goes out to dinner, he is on it 75% of the time. But even he refrains during a performance because he is, you know, watching it?
Last time I was at Rent a ton of people whipped out their phones during One Song Glory. Incredibly distracting.