Snap, exactly the same scenario in our home..
About four years ago my DIL tested DH's hearing and told him, that he had slight hearing loss. He took it as meaning his hearing was fine and has continued to be fine, ever since. It certainly is not, but he refuses to go for a test!
I am driven to distraction by the chaos, he is causing, by mishearing and getting things wrong, including buying a new car!!! I was standing behind him, warning the salesperson, that he hadn't heard a single word of what she said.
It's everyone else, who is mumbling!!! Don't even mention the volume on the TV. It is deafening. ?