He's just a puppy and has no idea what 'misbehaving' is.
WAY better for us to ignore the 'bad' WHILE teaching them instead what we want. Engagement training? Top Training Expectations for Puppies
Using treats and toys as rewards for what we DO want.
Frankly he sounds bored and is just inviting you to play. Like dogs do. ALL dogs until taught differently.
So here he is, bored, full on energy, trying to get his best bud to play with him. And what do you do? Yell at him?
Instead, if you come home and go outdoors for a rousing game of chuckit/frisbee that would solve everyone's problems and EVERYONE would have fun. No bad dogs, no chewed on human.
How are the dog classes? What is the instructor recommending? Maybe adding fun classes like agility would help you learn to better manage your pup and gain a leadership role.