Is he being too harsh on his daughter? 

There are a lot of parents out there who do not tolerate their kids getting less-than-perfect grades. If their kid gets an 89 on a quiz, they aren’t allowed to see their friends for a month. I think most of us can agree that such punishment is too harsh and doesn’t achieve the results parents want. They think that being harsh on their kids will make them disciplined and high-achieving. In reality, kids who aren’t internally motivated to be the best at everything will resent their parents for viewing them negatively for being average, or even above average. Some kids will beat themselves up for not getting perfect grades seemingly out of nowhere. Their parents don’t particularly care whether they’re an A+ or a B- student: they care more that their student is trying their best, and not going overboard. 

Kids who come from families with high expectations might appreciate the discipline their parents instilled in them from a young age, but there’s a better chance that they will learn that no amount of hard work and achievement will buy their parents love and affection. They can always be «better,» and if they learn that their best isn’t good enough, they won’t be motivated to try at all. 

The dad in this story, u/OldDadWithABadIdea, thought that banning his daughter from seeing the movie version of her favorite webseries would be sufficient punishment for getting a B and a B+ on tests. I would understand if she had failed the tests, but is a B worth all of this?