There's a difference between badmouthing and constructive criticism. Try reading through the entire article. I did. And there's tons of badmouthing and condescension.
The article is filtered through another reporter and I didn't find specific instance of badmouthing (but my reading is also filtered through my own notion of where I think Alan Kay is coming from.)
If you're interested in what Kay really means, maybe listen to some of his numerous other talks?
