I know it's cool to hate on people who hate video games, but I feel like we REALLY got one half of the story.
Honestly, I bet the kid was struggling in class, or wasn't taking his studies properly and was distracted by video games, and so his father was putting the foot down to make sure the education comes first.
That said, the parents are paying for his entire college, providing a place to sleep, food, rent. They get a say in his life because they are footing the incredible bill for it; if he feels like they have no say in his life, then he is, as the father pointed out, quite welcome to pay for his own life