thanks! you are so kind!

Hello Lu! I think what the video is trying to convey is that in order for people to see that they are being unreasonable or overreacting, humor is needed to diffuse it. He is saying that trying to be "mature and reasonable" or trying to explain in a way that is too serious won't allow the other person to see how nonsensical their reaction is. It may actually be worse than egging the person on in a humorous or sarcastic manner. Basically, "Don't be adult about it; be silly and the other person will understand that they are overreacting." I hope that made sense. I'm not sure if I was clear. Let me know if that helped or if you have any other questions! :)