I think organisations like NAGC have a lot to answer for. First they tell virtually every parent that contacts them that, yes your child is gifted. Then they present giftedness as some sort of special needs that makes behavioural problems inevitable. Meaning that no bad behaviour is ever the child's fault.
I have a daughter who is both gifted and spends a lot of her classroom time in severe chronic pain (no, not from a swollen head ), but I would never feel I had the right to tell her that this excused any poor behaviour on her part. That would be the same as trying to sabotage her chances later in life; what right have I got to do that?
I also think the kind of preciousness described in earlier posts is going to make life much harder for the parents whose children are genuinely on the autistic or attention deficit spectrum. Heigh ho, here comes another one... when the child may actually have genuine needs.