But he does have a point. The others are hating 1A kids because of something that is in no way their fault. When people have that sort of attitude, accepting it or feeling guilty about it only reinforces that behavior. As Bakugo said, 1A kids didn't ask to be attacked by villains, so why the hell should they let the others make them feel guilty about it? He's right that they should use the festival as a way to do their best and enjoy themselves, rather than "apologizing" or "making up" for something that's not their fault.