He watched it for four seasons. I think that's more than enough time to formulate a thoughtful opinion on the program. your point might have some validity if he never watched it at all. Also, all he did was tell you why he stopped watching it. He expressed his opinion on an open forum about a specific topic. And expressing your opinion EVEN ABOUT SOMETHING YOU DISLIKE is not dumb (as you originally wrote), and yes, it DOES make sense (as you edited). Because the contrary is that ppl only express their opinions on a subject if they have something good to say about it. You would basically eliminate dissent and therefore all meaningful discussion if it was a thread of only ppl who sang the show's praises.
furthermore, the person about whom you wrote is the only person I read who basically said that they stopped watching the show due to strains on credulity. NO ONE ELSE WROTE THAT. So to everyone who said stop watching the show, no one else said they disliked the show. The discussion centered on one incident with one character in one scene in one episode. That hardly qualifies as I find the show so unbelievable I should stop watching. Maybe a more focused read through of the day's posts would reveal that, because no one I read wrote that (with the exception of the above). If I'm wrong please show me the post(s).
Finally, there's apparently a missed irony about condemning ppl who "complain". In complaining about complainers, you become a complainer- that which you negatively criticize. In your "what makes less sense" query, you offer up ppl who complain about the show and ppl who don't watch the show and complain. I would add ppl who complain about ppl who complain to your spectrum of complainers. You are a complainer once removed.
And no I'm not complaining.