Reasoned alternate opinions aren't the problem - it's obvious incendiary remarks by trolls, or people going on and on about lesbian encounters, things they consider NTR that other people don't, not having the kind of NTR they like, screeding about choices the Dev makes or doesn't make, including things as optional that offends them for even being part of the VN, etc.
Saying something like "I enjoy the VN, but am not the biggest fan of the FUTA/tattoos/presence of pubes/lack of pubes" etc., and then moving on isn't so bad, but when someone acts like a little brat and insists the Dev is awful for not taking something out, adding something in or whatever, that's the kind of thing that should be nuked from space and maybe even the person banned from the thread.
This is a pirate board for VNs. If someone is a patron and wants to be a little be-atch on the Discord or Patreon or whatever other forum, fine - the Dev can deal with them directly and determine whether their monthly contribution level is something they feel like keeping or not. But here, where most of the whiners are people that haven't ever contributed a dime to a Dev, fuck 'em, delete 'em, and drop 'em.