I would not consider that boy to be someone who is sinning deliberately and I would not call him a rasha. I would consider him to be in the category of someone who is at-risk because of psychological issues. He was doing aveiros only because he was going through a very hard time.
I don’t know the boy, but I’m not shocked. I think that I and most people have done similar things, although perhaps to a lesser degree. I don’t know if I would have ever said that I was angry at Hashem, but I have certainly done aveiros in my life because I was upset with other people, which is kind of the same thing but to a lesser degree if you think about it (since everything comes from Hashem).
I remember once when I was 16 doing something that I knew was wrong (although I was able to rationalize it as being technically mutar which may or may not have been correct) just because I was upset about something, and I remember thinking that it might not really have been okay but I was too upset to care.
The boy you are describing does not sound anything like the Rasha in the Hagadah. And he does not sound like someone who would have gained from the approach used in the Haggadah.