Yeah living with other people requires you to respect noise levels. It’s just basic courtesy. There are six in our house and we have an earliest time that the shower can be turned on for example. Of course exceptions have to be made.

If he’s not prepared to turn down the TV to a reasonable level that’s on him. He knows it’s upsetting you and is prepared to continue upsetting you. That’s really unhealthy and inconsiderate behaviour.

One thing that might help is getting him to use headphones with the TV. Most TVs these days have Bluetooth support. If I’m watching a movie late at night (common) I’ll always use headphones. Again it’s just common courtesy.