Was your dog trainer a member of the ADPT? I suspect not but would be happy to be corrected. Did you get a behaviour programme to follow and a follow up meeting etc?
Your dog is not being arrogant, he is a dog, he has no concept of being arrogant, dogs are amoral, they will do what works for them.
Have you ruled out any medical issues that would suggest a reason for the toileting inside? Otherswise, this may be a learned behaviour, it may even be stress. What do you do when he toilets inside?
When you say you correct him, what does that entail? If you are telling him off or punishing him, that may very well be the reason for the toilet issue and 'needy' behaviour.
Grab a bag of treats, everytime you spot him doing something that you like, reward him, even if it's just laying quietly. Dogs will work for reward, be that food or cuddles or a play with a toy etc. Ignore the behaviour that you don't like or want, the dog will hopefully soon learn that this doesn't produce anything meaningful for him and display behaviours that do get him something he wants.
When you walk him, what do you do? Is the walk exciting for him? I took our two out this afternoon. We took a toy, we did some training, I did some scentwork with them, they focused on me for an hour. They are knackered now, so that was worth an hour of my interaction.
How about some toys that gets his mind working? Kongs, puzzle toys etc?
I might be wrong, but your post doesn't sound terribly enthusiastic about this dog, and he might be better with another home, dogs do require time and commitment, and that is hard with a young family, it's just your language is so negative.