Pretty straightforward — Theo De Raadt is quite a well-known "controversial" character, and he's pretty blunt with it, too. Remember, he's the guy who was punted from NetBSD for "[a] long history of rudeness towards and abuse of users and developers," and the guy who Linus Torvards described as "difficult."
He's also an astoundingly capable, effective and security-focused developer. This means that there's probably a hole in the FreeBSD distribution of OpenSSH that he's aware of any has not disclosed. Dickish behaviour, but that's his MO, so there's little to be surprised about.
