I have trouble understanding. In fairness, I accept that I'm pretty dumb, and I've only briefly looked at the steam forums, skimming through a couple of the posts just prior to full release.
But what's there to argue about? Some people don't like the bisexual content? Shrug. If they don't like something in the game, that seems like reasonable feedback.
Meanwhile, if someone else does like bisexual content, they can say they do like it, equally giving feedback. This doesn't seem like it has to escalate into an argument. No one's going to convince someone else to like something they don't like, anymore than someone else is going to convince them to suddenly not appreciate the content in question.
It doesn't make any sense to me, and I mean that sincerely. It's just this never-ending culture war stuff. I can't be the only person who thinks it's grown tiresome.
I am glad you brought up culture war stuff because at the core of culture war issues is "people being upset about things that don't materially affect them at all."
If someone doesn't like LGBTQ content then they don't have to interact with it in game. It's ok to say "I have no interest in this" - but that's not what people are saying. They are denouncing LGBTQ+ and saying purely hateful stuff...and getting away with it. There are racist comments being made as well along the same lines.
Larian has a remedy here according to the terms of its Steamworks agreement. They could demand to send their own moderators to the forums to handle this stuff - obviously they would have to recruit or hire some, or press some interns into the job.
The question is are they concerned that it would put a dent in their sales. Some bigots might buy the game to "see what all the fuss is about" and hey, now we have your money.
Or all the bigotry could be fueling sales for people in marginalized communities - who want to experience this "woke" game for themselves - or just get really happy when something upsets racists and homophobes.
Personally I would send in the mods and clean house, but it's not my decision.