He doesn't wanna talk about it😕

My step daughter and son went out to the beach yesterday for a party. It was a summer is coming to and end party. They both came home around midnight and my son stayed in his room the whole day. My step daughter told me he got humiliated at the beach because he lost his swim trunks to a wave and one of friend "friends" gave him a towel to help him out and when he was going to the car the friend yelled for everyone to look and ripped his towel and people were laughing and taking pictures. And he went to the car to cry. I asked him about what happy and he said he doesn't wanna talk about it and he's fine and I said his step sister said he cried and he said that she can shut her fat mouth and slammed a door in my face. Which my step daughter heard that and her feelings got hurt. So now both kids are upset 😕