At worst people end up defaming an innocent person over something said about a fictional character.
Over at theforce net Jedi Council Forums, I made an offhand comment on a thread that Luke's fantasy dream with Camie in the Last Jedi novelization (someone who had bullied him and called him Wormie) seemed out of character (out of character that his dream would be with someone like her instead of any other women he'd met who were kinder to him).
Immediately, a moderator and another poster (both of whom were male) teamed up against me, said I was a sexist "nice guy" who hated women in publicly accessible forum posts (none of this is remotely true just to be clear) in regards to this post about Camie (a fictional character) and banned me on the spot. In shock, I messaged the moderator and said if my post about Camie (I didn't say anything bad about her at all, just that it seemed unrealistic she'd marry Luke even in a fantasy dream) was off they can delete it, but that his and the other poster's posts declaring me sexist (all publicly accessible) were false and defamatory and should be removed.
In reply, the moderator wrote a taunt "Lawyer up", which I then had to spend an inordinate amount of money to get a law firm to look over theforce net forums, only for my attorney to find that the defamatory content was removed (the moderator must have realized I was taking this very seriously by that point).
My lawyer then saw the mod's message to me that the ban was for 48 hours and we felt the matter was resolved. However, after 48 hours passed, the ban was still there and I asked the mod what happened. He said for daring to ask and not "apologizing" for sexism (about a fictional character keep in mind, and over comments about her history of calling Luke Wormie not her gender), the ban was extended to 96 hours. This was years ago, and it's clear my ban is permanent unless I "confess" to their accusation of sexism.
I really don't want to see that kind of thing here in Trek fandom. While combating sexism/racism etc. is important, outright accusing someone of being sexist/racist/etc. solely on opinions about fictional characters without evidence of real life wrongdoing is just outright defamation and can seriously damage someone's life.