I only go sometimes and usually just when my siblings really want to see a movie. The cost of going to the movies is too much these days and food is double what the tickets cost so I rarely if ever buy food.
Depending on what time of day you go and on what day, ticket prices vary, but it's somewhere around 12 to 14 dollars most of the time. Food is what really costs, while we don't buy food, if we did it would be a lot. Just buying one large popcorn and 2 drinks costs close to or over $20 depending on if they have a deal. For that reason we eat before or after or sneak in a snack.
I've never had a disruption at the theater probably because we don't go often enough to witness one.