This scenario is incredibly common. My child is Autistic/ADHD. I now see his father is high masking Autistic and I never realised. There is a common theme in many situations on multiple threads on MN and other places online where the high masking Autistic fathers ( probably undiagnosed) will resist the reality of the child's Neurodivergent status at all costs. Possibly they don't see the difference in them and think it's no big deal. It's never easy to understand this.
It also feeds into another risk which is that I feel many ND kids are more vulnerable to the narcs. They may also become one. THIS IS ALL OUT YOUR CONTROL. It is nothing at all to do with you or anything you can change alone. Genetics, environment, peers, it all influences and you are not all those things.
You can't do any more than you're doing. I have two nephews who are my sociopathic brother's kids. The older boy I know is not going to be personality disordered. He is inherently more sensitive and gentle. The younger, possibly will. My own teen, yes, I am seeing it.and sensed something from young. I tried everything imaginable. I of course absolutely love him.
What will be will be and it is not your fault or in your power to do any more than present ' normal'. You can say ' ah ok, I don't agree that is true. I think X y z. You're wonderful just as you are, whoever you are. Shall we go do this now.....'
Therapy is helpful in navigating these situations. A female therapist who understands personality disordered people and possibly also Autism.
( I am not associating the two btw. The risks I believe are greater for various reasons).
❤️