It all boils down to console wars, which further boils down to tribalism. People always seek out a rival, or a counter in society. Good vs bad, black vs white, dems vs republicans, us vs russia, films vs books, and most pertinant to this, the product i like vs the product you like. When some people buy a console, they feel they are on a team because of the admittedly toxic rhetoric around these boxes online. So for exclusive games, a bad or a good metascore could be viewed as a “win” or a “loss” for your favorite team. Sports fans, and comic book fans do the same thing. So when an xbox game has a lower metascore than a playstation game. Ps fans celebrate, because it means there team is still winning, same when the sitatuation is flipped.
i hope that explains it well. I honestly think console warz, and tribalism in general is sort of fascinating. Most adults know the behavior is pointless and stupid, but for some sub conscious reason a lot of people engage in it anyway, myself included.