Young children have a tenancy to think that the rest of the world is exactly like their home, because that home is their world. Then when they experience the outside world things seem strange.
Like the above anecdote, I remember thinking it was weird when a neighbor made Taco Salad with Frito's instead of Doritos.
I remember how weird my grandmaa's house seemed all around when visiting. The food was different, the board games were different, it was all strange.
I think this anecdote is the same. Its not so much a case of the wisdom of the children, but just another example of a child not understanding that the entire world isn't like their sheltered existence. [I don't intend sheltered as a pejorative here.]
I'm sure there were plenty of other things on the trip that seemed broken, but none happened to be as evil as commercial TV.