I couldn't agree more.

If you think he's a great Prof, you should work hard to make sure to not humiliate him in front of the class. Even if he has a really positive attitude and doesn't hold it against you, he's going to start to dread seeing you or what you'll say next about his code snippets. This won't help him or the class.

As TGI says, offer to work outside of class to proof his lessons. That way, you both will take away something positive from the experience and you'll make a friend. Having a friend on staff in your Department will be a big plus in years to come.