Turn it off. Change the channel. Unplug the TV. Do whatever it takes.
I was in a waiting room one time. Waiting for my car to be serviced. The ‘Spew’ came on. I promptly changed the station.
No one cared.
Buy a cheap universal remote. You can program it to any TV that’s on. Carry it everywhere. Turn it on Fox.
While visiting someone in the hospital I was subjected to the Commie News Network until I couldn’t stand it any longer. I went to a Best Buy and purchased a programmable universal remote control and then spent the time scanning the frequencies until I figured out the code for the boob-toob in the waiting room.
I switched the channel to FNS when the room was empty and then over the course of the next week kept turning it back when the staff would change it. They finally gave up ;’}