Poor kid...
We use the golden rule around here; everyone is expected to treat one another the way they would want to be treated. I can't imagine your husband wanting to be treated that way as a child or an adult. Now I'm all for not sweating the small stuff and there are respectful ways to teach a child this lesson.
I would also want to add, that family is special to me and should always feel like a safe place to express our true feelings. Imo, your husband is pushing his son away by disrespecting and humiliating him.