A misconception about ADD is that those who have it can't focus on anything for too long. On the contrary, there are many times when I can focus on things intensely -- especially things I enjoy -- and tune out the whole world around me (I won't even hear you speaking to me), and that is also a symptom of ADD. Does your son do that?

What I find strange is that on one hand the teacher is having him tested for gifted status while on the other insinuating he might have ADD or some other learning disability. Where does that leave him? And can't he be both gifted and have ADD? This teacher frankly sounds shady. If I were you, I might request to switch your son's class. What grade is your son in?