Well, for our son, it isn't the "boring" activities, it is the fact that he gets distracted very easily. Where other children can block out distractions, he hears, along with the story, every sound in the room, people coming in and out, coughing, sneezing, the air conditioner cutting on, someone next to him playing with their velcro shoes, etc. It would be like if you went to a restaurant, and while trying to pay attention to your DH/DW or whoever, you also heard everything else going on and couldn't focus on that other person.