Does Shatner ever say anything that isn't controversial?
I think he was, as he always seems to be doing, just poking fun. I've seen him make live appearances, he's always talking shit about someone/something. Watching him and Nimoy together you could be forgiven for wondering if they really are friends.
I wonder if Levar Burton didn't misread this statement and feel embolden to lash out at JJ himself.