Yeah. One day people will learn reviews are just opinions. One day.
I also hope they learn to that reviewers are just people like you and I that are paid to give their opinions and are not some kind of mystical neutral arbiter of universal quality.
i think it stems for a number of reasons.
The first is that some people do believe, correctly or incorrectly, that there is a degree of objectivity in the analysis of games i.e. reviews. The technical nature of video games, relative to other entertainment mediums such as film and TV, mean that video games could be objectively analysed from a technical standpoint. This could also stem from other points. For instance, game critics or 'YouTubers' are ingrained in there own social norms of game design and preferences, moulded by their own history, culture and they type of critical game media they consume. Now, whether you think a review of games are objective, subjective or a subtle combination is up to you. This is subjective in itself!
The second reason is that games media, moreso than other types of media, tends to attract a warlike admiration with fans of video game series, paralleled only by sports fans (I am thinking of football in this case). This culture creates an irrational dislike of any criticisms. This also prevents nuanced discussion about games to surface. For instance, by providing anecdotal evidence, videos that provide a list of the 'top 10 reasons why this game is disappointing' have to signal, at the start of a video, they they still love this series, and that criticism is a signal of their love for the series. This wouldn't need to be signalled in the video games review industry if people, generality here, were not irrational.
This brings me onto another point. There are a wide spectrum of frameworks and criteria that reviewers use to analyse video games. With the rise of the internet as a forum for this, the variation has exploded. People who are foreign to one type of framework may misunderstand and therefore could dislike another. This can range from the type of scale they us to review games, if they review games from a comparative perspective in its series/genre or in an absolute perspective, against a more rigorous technical standpoint rather than its artistic achievements, and more. Again, these frameworks are moulded by a complex interplay of history, experience and perspective.
To conclude, peoples' perspectives of video games are wide ranging and formed by a wide variety of history, experience and media consumption. An asymmetry in the consumer's knowledge of various frameworks and reviewer's histoires also help exacerbate this. All of these are general points that, of course, do not cover everybody.