obstinate
Like a person who refuses to take the hint even when it’s being handed to them on a plate.
My mom is obstinate. She still won’t stop yelling at the TV even though she knows the show is on mute.
My friend is obstinate. He won’t admit he’s wrong even when I show him the proof.
My dog is obstinate. He won’t stop barking at the vacuum even though it’s just a regular vacuum.