It burns the old Jedi texts for crying out loud, as a statement that the ancient history of the Jedi is boring.
That really pissed me off as a message the film gives at that point. “History is boring, let’s burn it for a few laughs.” And coming from Yoda it didn’t suit at all. I get the idea what it was trying to make which is let’s begin with a clean slate, but you should never turn your back on history. It always teaches something. That’s like burning constitutional laws or something.