The JB thing was all about other BE assistant coaches voting GMac as the most overrated player in the league, not about what Ethan wrote. He just happened to say the same thing earlier and JB, who never forgets a thing, included him in his famous rant. It wasn't like he went off on him directly, in person.
He has done that a number of times with DO reporters, mostly in post game interviews. At least he doesn't discriminate; seems he goes off on just about everyone at some point.