I know a poster that got banned because they liked all of the Trek shows, except Discovery.
Another poster was accused of misgendering Adira and being asked to apologize, and the poster didn’t understand how they were supposed to apologize to a fictional character. So the mod banned the poster instead of answering the question.
Another poster didn’t like that Rios smoked and thought that smoking wasn’t cool and got banned for that.
Another poster had issues with the PIC S2 arc and was told they weren’t providing examples and they shouldn't participate if they weren't going to.
From my experience, I know from other subreddits that the mods think some posters are not arguing or commenting in good faith and will delete the post altogether. And, TBF, Reddit is a known LGBTQ+ safespace, to the point they banned the word “groomer “being used on the site last summer. Considering how Discovery has been received ever since it came onto the air and it has the largest LGBTQ+ representation in history, its not surprising how some mods act on Reddit in regards to that show.
That all being said, the site does go overboard in pushing hiveminds and echo chambers to the point that actual discussion is impossible. And for some subreddits, its on purpose to cultivate a certain userbase for those subreddits. And in addition, some mods do seem to abuse their power over there, and won’t even explain what rules are broken to justify deleting the post or banning the user. And users abuse the downvote button and the Reddit Cares message. So the issues you faced are not exclusively to the Star Trek subreddit, though the Star Trek subreddit should be one of the more openminded subreddits on the entire site. It seems to have gone downhill in only a couple of years.
In any case, Reddit’s behind me. I quit the site for good not that long ago and I’m not looking back.