Let's even pretend that he is right for a minute: surely this still isn't a good look. The stuttering-nazis-they started it stuff is the stock in trade of the web imbecile. In the past he had the presence of mind to mock this type of oblivious hysteria in his comedy, now he has become one of his own characters.
If you're going on Newsnight with a divisive opinion then wouldn't you try to dial back the antagonism, set out your concerns in an authoritative manner and acknowledge that you could have been more resonable in the past, while still holding firm on your position. Getting embroiled in a semantic debate about the merits of a nazi metaphor is utterly amatuer.
I sort of feel bad for the guy.