Do you mean an hour leash walk? If so, that is not enough to get him tired and full filled. You can walk him on leash all day and he won't be tired. Do you give him stuff to find, solve etc? Are the walks interesting for him? Like letting him climb, navigate obstacles, are you interesting for him, etc? You cannot expect this bratty behavior to go away without a lot of work. Some will let you get away with slacking off on obedience but the more assertive dogs will look for and use the loop holes.
I only go for a walk after he has played fetch for about 10 minutes to get rid of some energy. And I don't trust pups outside their crate before they are about 1.5 years old although it is tempting sometimes to do it sooner. Just look around what they can ruin in two minutes.... and you'll be happy to crate them. Tons of toys don't guarantee a content dog if you don't use them with him.
Generally you could say that when we are frustrated with our dogs they need: exercise, training, NILIF and plain fun with you. He kinda like a human 15 year old bored with school. Is he in a class?
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015