If someone gave you something REALLY exciting, that you REALLY liked, that you where just over the moon about, and then they started to try and interfere with your enjoyment of it, you'd probably get irate and give an attitude too. I think if I gave something to Emma that she was really really excited about, I'd enjoy her enjoying it. If it was in a restaurant I'd be extra happy that something was keeping her occupied and I'd enjoy the rare chance to eat my meal uninterrupted. If someone did to an adult what you did to him, they'd get angry, try and see it with some empathy, his feelings aren't less simply because he's a smaller person. If Emma was making a huge mess I might have stopped that, but just playing with it, no, I wouldn't have interfered or decided that he should eat and therefore take something away that he was totally excited about. What is a possession you might treasure for say, your birthday, a really awesome expensive camera? A new car? Something really awesome. I think you'd not want someone's hands in there interfering with your discovery of your new prized thing either. Think about it.