I guess it’s kinda bad to deny the fact that you’re sad, to deny your humanity, your vulnerability. But it’s difficult to give up your front. No one wants to see you weak. You don’t know what to do with yourself, and no one knows what to do with you. You don’t want pity. You don’t want people to think you’re spineless. So what do you do? 
You choose to get angry. You choose to throw things and punch people in that face. That way, no one will know you’re human.