^
If you've been following CfB you quickly realize, that he is very smart and usually very polite/kind.
I have never seen him not answer an honest question or abandon a real discussion.

IMO he has grown tired of some well known trolls, which is reflected by a certain anger or lets call it impatience.
They behave like academic scum and use twitter mainly for trolling and nothing else.
I can understand his reaction and given the history he still behaves civil. He is not a PR person and he owes you nothing.