The r/KanojoOkarishimasu is especially bad, mainly because it has all the ingredients for the perfect storm. You take:
1. A system meant to thrive on user engagement
2. Chizuru's main attraction being her looks
3. The general nature of Chizuru stans (aggressive and hostile towards anybody else)
4. A userbase that doesn't like to interact or engage beyond surface level discussion
This composes r/KanojoOkarishimasu. The system thrives of off user engagement, and some people have turned it into a game a garnering little red arrows (there was even a controversy over whether or not the arrows were red or orange). Best way to garner attention is to market your post visually, and the girl that visually appeals to the most amount of people is Chizuru, and the best way to not lose any internet points is to post a "hot" take about how [insert girl besides Chizuru] is garbage. This attracts the aggressive and hostile Chizuru stans, and the system turns into an echo chamber where no dissanting opinion is allowed. The most representation any other girl besides Chizuru gets is the "daily [insert girl besides Chizuru] picture" with, most of the time, zero comments beneath the picture as verbally supporting another character is forbidden.
I once saw a post titled "Who is Best Girl", clicking on it revealed the body text to say "and why is it Ruka?" The post is now deleted with only two internet points to its name, and over 15 comments. A innocuous comment about a girl other than Chizuru being "best girl" was enough to place that thread into the "controversial" section.
Which is why I decided to post here, as my arguments would rise or fall by their own merits. There would be no casual Chizuru stan who could just downvote an opinion they didn't like, they would either have to make an effort in responding, or ignore my comment outright.