Maybe 'Questioning' is another example of modern Aikido. Maybe it breaks an old Martial tradition, one practiced by Ueshiba.
Never insult or bring into question your teacher. If you disagree then thank him for all he taught you and move on. Thereafter to speak only of what you do now and only respectful comments or at worst silence about the the past teacher.
In my mind it's unhealthy.
Think you got a point here. Just a thing to remember: "Insult" is kinda cultural/country bounded. What's insulting in the "east" may not be insulting in the "west".
Just my 2 cents, D.