Just because you comment on something doesn't mean you'll use it
You can't change font size? But what if I don't like to read walls of tiny text?
And what the hell is with the video playback UI? I want to see comments under a video post, why do you take me to full-screen video playback no matter what I do? About 50% of the time I manage to tap something somewhere which makes it work on 3rd try, but I wish that percentage was higher.
"Yet you participate in society. Curious! I am very intelligent."
It's possible to voice disinterest in a thoughtful and substantive way. The GP comment (and arguably your reply) does not.
There are plenty of topics I find fun to engage in dialog about, despite having no interest in the topic itself.
We, as humans, seem to generally enjoy being a part of the zeitgeist, being swept away with whatever the latest fascination is, even if we aren't interested in the actual topic. And that's ok. We are allowed to enjoy that social experience on both the micro ("all my friends are getting really into houseplants, I will too!") and the macro ("lol, Elon Musk is an unbelievable idiot") scale.