Should special children be looked down upon?

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My son is 22 years old and has ADD (Attention Deficit Disorder). Although sometimes he acts normal, most of the time, it's hard to communicate with him. Since the ADD was detected when he was about 2 years old, he had undergone a series of therapies to help him focus, until he was at least 5. He even had to take medication before going to school, so that he can concentrate well. He's such a smart person. And he really has a talent for the arts. But he has lost interest. No matter how much encouragement we give him. Now that he's grown up, his condition still requires utmost patience from us parents. I've read some books and articles about ADD, but it's still different when you're hands-on. The psychologist who took care of us told me to just give him time. They are usually slow to mature. But when they do, they will be successful in whatever they do. Do you have any experience to share with me? How difficult and frustrating it can be sometimes?