Well of course he would beat him in a fight. Chael's a pro fighter. What does that have to do with anything? Is that now a valid retort to any criticism of a fighter "Oh yeah, well I could whip your ass"? I felt like Chael got frustrated with the guy and while I don't blame him for responding as he did, this was hardly some kind of genius verbal lashing. He just talked over him, threatened him physically, told him to leave, and called him stupid a bunch of times (apparently chael has trouble finding synonyms without his writing team).
I agree, who ever it was that asked those questions clearly hit a nerve (because it was the truth) and Sonnen reacted foolishly.