Perez said in another interview that "thankfully, he doesn't" want to take dance class - which is also problematic. But at least we know the boy hasn't asked to take dance and been denied. He also defends his decision by saying that (to paraphrase) "homosexuality is still a harder life path." To put it as you did, by denying him the option of a dance class "he's giving his son the very grief he says he wants to protect him from."
Being a parent is not about raising the child you want; it's about nurturing and cultivating the best of the child you have.