>>47378220Your parents probably saw a correlation between a low grade and your younger brother's hobby. Tell him that this will happen all the time with many people.
Your parents, your teacher, your friends, your future boss, and lovers will do the same for x reason.
Tell him there is no reason to be angry, just deal with it. Evaluate yourself to find out if that correlation is significant and move on with the punishment. Next time, don't show pokemon material like a sperg in front of everyone.