Went to watch the new sonic film yesterday with my DC. They are 8. He sat through it fine. There were lots of other kids dotted around watching it too. In front of us was a family. 2 boys aged around 4/5 and a little girl about 2/3. About half way through the film the boys start standing up and walking around but they weren't making any noise so I didn't mind really. The little girl was shouting, talking, running around the row and front of the cinema. It was so distracting. Other people on my row were also sitting up and looking over.
Aibu to think you shouldn't bring a child to the cinema if they can't wait the whole film without distrupting it for others. I know there are special screenings for young children when this behaviour is acceptable but it was not this type of screening.