If they’re not prepared to turn down the TV to a reasonable level that’s on them. They know it’s upsetting you and are prepared to continue upsetting you. That’s really unhealthy and inconsiderate behaviour.

One thing that might help is getting them 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.

FTFY