I agree I don't take it seriously in that way, but I do think that in those cases it is kind of pointless.
Because people are not going to convince me that Kenobi was a good TV show, regardless of how much they praise it unless they can throw some arguments in there to convince me why it is good. But that is not really what people do on Reddit, because as you say, I think they have an agenda.
I haven't seen that show, although I recall from my time posting on the IMDb discussion boards (before they were zapped out of existence), I know people can be quite contentious and quarrelsome when arguing over movies and TV shows. But it wasn't really very well moderated and had a lot of trolls, which is likely the reason it got ashcanned. They also had a political forum which was a complete zoo, and it got progressively worse leading up to the 2016 election. It was shortly after that they pulled the plug on the discussion boards altogether.