> If someone is showing you a tv show it seems extremely rude to me to not look at the show as a way of passively showing disinterest vs just saying it’s not for you; no?
Those aren't your only two options. There are almost infinite ways to communicate.
I don't understand your question. That's how people express emotion, mostly. I'll trust you are not being argumentative:
Facial expression - eyes (the muscles around them), mouth (smile, blank, frown, etc) - posture, legs, arms, etc etc etc. You can look disinterested, you can look like it's the best thing ever, or any other human emotion.
Those aren't your only two options. There are almost infinite ways to communicate.