Personally, I think that the "whispering around the corners" that happens in Aikido sets up an unhealthy dynamic. It's okay to speak about things in private, behind people's backs, but not in public? In my book, if people are putting out information in a public venue then it is OK to question that information in a public venue. Nicely, of course.
Well... I think there's a certain amount of hypocrisy in statements like this. How much would you say about your boss in public? Or a close family member? If the Internet Age has taught us anything, it is that comments on the public web have a way of finding their way back to the person concerned, usually in the most embarrassing possible way.
So it's all very well to say that this or that teacher's public statements should be subject to public criticism, quite another to put that teacher's students in a position of having to align themselves (or not) with the critic.