I imagine you have your own methods to handle these types of discussions, but this is my trick.

"Have you watched random niche show you've never heard of?"

"No, but I've heard it's pretty decent. What's it about?"

At this point, you can check out of the conversation while they talk about a show you'll never see. Personally, I like to half listen because I like to hear about stuff people have a passion for

I like to think he’s overwhelmed by an instant realisation of his own brief mortality in the face of what must be hundreds of cumulative hours of shows that he will most likely never watch