My 4 year old has recently started laughing when someone hurts themselves. I have only seen him do this with family members eg me or his little sister. Eg I bumped my head today and he started laughing in a gloating sort of manner. He has been gloating a lot generally recently eg if he thinks he has something that's better than someone else.
I find the laughter extremely upsetting and I don't know how to deal with it. Is there something wrong with him? He can be kind and loving at times so I know he can do it.