So far nobody gave any indication that he had (or tried to have) a social life. He kept to himself in school and at work. To cut off his parents seems extreme. Were they controlling?
We don’t know yet. I'd expect, parents were overly protective of their only gifted child.
But imagine they were not controlling. The general trend: pushing the kids is to perform academically, to get into prestigious STEM schools. But maybe for a shy, introverted person, it is better socially to stay in regular high school and not break old friendships? Just hire him good tutors instead. The answer is always in the negative, "let him graduate with the best grades ever and get into the best college, and then his life is set".
Then the kid departs to a good college, to realize that people around him are as smart as he is, but more social, and he can't get friends. Some start partying. But frequently, depression sets in and kids drop out of schools.
And these kids often end up being angry with their parents, because they feel lied to. They were promised all the good things (girlfriends, friends) "later", but it never happened. (Just in 2020es: the kids who invested a lot into STEM, may not even have the jobs they expected in their cards).
In many families, one parent is not social, and the other one is. IMHO, for the introverted kids it is generally better if the mom is social because then she invites friends into the house and friends bring own kids so there is exposure to normal communication. A good option would be to enroll shy kids into drama classes in summer, but instead, everyone adds up more coding schools.
So i wonder if something similar happened to CV. The parents did not pay attention to his lack of social skills in school and then sent him off to a prestigious college. They likely bought him a condo, "he is an adult, he needs to date", but being socially awkward, he'd bring no one there. I think he was a show-off in classes because it was an immature way to attract attention and get friends, btw.
The ideal example of why early social development matters. This man was the smartest Harvard graduate ever. And how did he end?
en.wikipedia.org
So in short, I think CV was angry with the parents because what they promised, failed. His failure in life was due to profound lack of social skills. Somehow he blamed it on them.