I am posting from the perspective of an autistic women, who is part of an autistic family.
As others have said, like those with the predominant neurotype (non-autistics) autistic people can be abusers too. However, it sounds like your dad doesn’t have any confidence. Plus, those around him do not respect his needs or show him any compassion, especially around his differences in relation to socialising, therefore he’s often anxious, is made to feel like he’s in the wrong, so he gets angry and tries to assert greater control to cope as his life feels out of control. If you look at how autistic young people were treated in the 60s/70s their natural differences were seen as deviant behaviour that needed to be punished - did your father grow up in a setting of abuse, therefore, that’s the only way he knows how to cope?
From your posts the impression that I get is that you haven't met or looked at much literature from the autistic community, so your views are old fashioned and you see autism as a problem, when actually the problem is how others view autism and treat autistic people.
It's natural for people to think their way is better. I am surrounded by neighbours who are stereotypical PNT women. They have lots of superficial relationships, waste hours talking about mundane, pointless rubbish and they go to social events due to the pressure to socially accepted not because they want to be there. Consequently, they spend a lot of time slagging other people off on the street corner as they have miserable little lives that are dictated by the need to fit in rather than meeting their own needs.
On the other hand, I have one friend who would be there for me in a heartbeat if I needed her. I also have my daughter and husband to socialise with. As a family of autistics, we do things because we want to not because our lives are dictated by others. I am incredibly grateful that we are not shackled by the need for social acceptance. I do feel incredibly sorry for my neighbours and in my view their behaviour is disordered but how would vocalising this and treating these people as lesser help, such as suggesting they went to support groups in relation to their behaviour help? It wouldn't, it would needlessly affect their self-esteem, aspirations etc when it would be much better to make the effort to accept and embrace their natural differences.
You say your brother has a good job, own house and he socialises as a stereotypical autistic person. From the autistic view point it sounds like he has a great life.
Why do you feel he has a problem?
What benefits would it add to his life telling him that society views him as being disordered/disabled?
What negatives could that bring?